diff --git a/Cargo.lock b/Cargo.lock
index f3509d7..a0c7d19 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1178,8 +1178,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
  "libc",
- "rand_chacha",
- "rand_core",
+ "rand_chacha 0.3.1",
+ "rand_core 0.6.4",
+]
+
+[[package]]
+name = "rand"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6db2770f06117d490610c7488547d543617b21bfa07796d7a12f6f1bd53850d1"
+dependencies = [
+ "rand_chacha 0.9.0",
+ "rand_core 0.9.3",
 ]
 
 [[package]]
@@ -1189,7 +1199,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.6.4",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.9.3",
 ]
 
 [[package]]
@@ -1201,6 +1221,15 @@ dependencies = [
  "getrandom 0.2.16",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "99d9a13982dcf210057a8a78572b2217b667c3beacbf3a0d8b454f6f82837d38"
+dependencies = [
+ "getrandom 0.3.3",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.5.17"
@@ -1301,9 +1330,11 @@ dependencies = [
 name = "roll-one-ring"
 version = "0.1.0"
 dependencies = [
+ "bytecount",
  "color-eyre",
  "dotenvy",
  "poise",
+ "rand 0.9.2",
  "tokio",
  "tracing",
  "tracing-subscriber",
@@ -1951,7 +1982,7 @@ dependencies = [
  "http 1.3.1",
  "httparse",
  "log",
- "rand",
+ "rand 0.8.5",
  "rustls 0.22.4",
  "rustls-pki-types",
  "sha1",
diff --git a/Cargo.toml b/Cargo.toml
index a82d9df..52120a9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,9 +4,11 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+bytecount = "0.6.9"
 color-eyre = "0.6.5"
 dotenvy = "0.15.7"
 poise = "0.6.1"
+rand = "0.9.2"
 tokio = { version = "1.47.1", features = ["macros", "rt-multi-thread"] }
 tracing = "0.1.41"
 tracing-subscriber = "0.3.20"
diff --git a/src/discord/mod.rs b/src/discord/mod.rs
index 532bf97..6301604 100644
--- a/src/discord/mod.rs
+++ b/src/discord/mod.rs
@@ -2,7 +2,8 @@ use color_eyre::eyre::{Error, Result};
 use poise::serenity_prelude::{self as serenity, FullEvent};
 use tracing::info;
 
-mod roll;
+mod roll_dice;
+mod source;
 
 type Context<'a> = poise::Context<'a, (), Error>;
 
@@ -17,7 +18,7 @@ pub async fn make_bot() -> Result<serenity::Client> {
     let intents = serenity::GatewayIntents::non_privileged();
     let framework = poise::Framework::<(), Error>::builder()
         .options(poise::FrameworkOptions {
-            commands: vec![roll::roll()],
+            commands: vec![roll_dice::roll(), source::source()],
             event_handler: |ctx, event, _framework: poise::FrameworkContext<'_, (), _>, _data| {
                 Box::pin(async move {
                     event_handler(ctx.clone(), event);
diff --git a/src/discord/roll.rs b/src/discord/roll.rs
deleted file mode 100644
index 4a2a145..0000000
--- a/src/discord/roll.rs
+++ /dev/null
@@ -1,70 +0,0 @@
-use std::str::FromStr;
-
-use super::Context;
-use color_eyre::eyre::{Error, Result};
-use tracing::info;
-
-enum Advantage {
-    None,
-    Beni,
-    Maudit,
-}
-
-impl FromStr for Advantage {
-    type Err = color_eyre::eyre::Report;
-
-    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
-        match s {
-            "aucun" => Ok(Self::None),
-            "béni" => Ok(Self::Beni),
-            "maudit" => Ok(Self::Maudit),
-            other => Err(Error::msg(format!("Could not parse {other} into an Advantage enum"))),
-        }
-    }
-}
-
-impl TryFrom<Option<String>> for Advantage {
-    type Error = color_eyre::eyre::Report;
-
-    fn try_from(value: Option<String>) -> std::result::Result<Self, Self::Error> {
-        match value {
-            Some(str) => Advantage::from_str(&str),
-            None => Ok(Advantage::None)
-        }
-    }
-}
-
-
-impl std::fmt::Display for Advantage {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        let str = match self {
-            Self::None => "aucun".to_string(),
-            Self::Beni => "béni".to_string(),
-            Self::Maudit => "maudit".to_string(),
-        };
-        write!(f, "{str}")
-    }
-}
-
-async fn advantage_autocomplete(_ctx: Context<'_>, _: &str) -> impl Iterator<Item = String> {
-    [Advantage::None, Advantage::Beni, Advantage::Maudit]
-        .iter()
-        .map(std::string::ToString::to_string)
-        .collect::<Vec<String>>()
-        .into_iter()
-}
-
-#[poise::command(slash_command)]
-pub async fn roll(
-    ctx: Context<'_>,
-    #[description = "Seuil de réussite"] sr: u32,
-    #[description = "Maîtrise"] mastery: u32,
-    #[description = "Avantage"]
-    #[autocomplete = "advantage_autocomplete"]
-    advantage: Option<String>,
-) -> Result<()> {
-    info!("Called /roll with following context: {ctx:?}");
-    let advantage = Advantage::try_from(advantage)?;
-    info!("Rolling against SR {sr} with mastery {mastery} and advantage {advantage}");
-    Ok(())
-}
diff --git a/src/discord/roll_dice/advantage.rs b/src/discord/roll_dice/advantage.rs
new file mode 100644
index 0000000..3a3ee42
--- /dev/null
+++ b/src/discord/roll_dice/advantage.rs
@@ -0,0 +1,41 @@
+use color_eyre::eyre::Error;
+use std::str::FromStr;
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum Advantage {
+    None,
+    Beni,
+    Maudit,
+}
+
+impl FromStr for Advantage {
+    type Err = color_eyre::eyre::Report;
+
+    fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
+        match s {
+            "aucun" => Ok(Self::None),
+            "béni" => Ok(Self::Beni),
+            "maudit" => Ok(Self::Maudit),
+            other => Err(Error::msg(format!("Could not parse {other} into an Advantage enum"))),
+        }
+    }
+}
+
+impl TryFrom<Option<String>> for Advantage {
+    type Error = color_eyre::eyre::Report;
+
+    fn try_from(value: Option<String>) -> std::result::Result<Self, Self::Error> {
+        value.map_or_else(|| Ok(Self::None), |str| Self::from_str(&str))
+    }
+}
+
+impl std::fmt::Display for Advantage {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        let str = match self {
+            Self::None => "aucun".to_string(),
+            Self::Beni => "béni".to_string(),
+            Self::Maudit => "maudit".to_string(),
+        };
+        write!(f, "{str}")
+    }
+}
diff --git a/src/discord/roll_dice/mod.rs b/src/discord/roll_dice/mod.rs
new file mode 100644
index 0000000..f3deb72
--- /dev/null
+++ b/src/discord/roll_dice/mod.rs
@@ -0,0 +1,45 @@
+mod advantage;
+mod roll;
+mod roll_result;
+mod success;
+
+use advantage::Advantage;
+use roll::Roll;
+use roll_result::RollResult;
+use success::Success;
+
+use super::Context;
+use color_eyre::eyre::Result;
+use tracing::info;
+
+async fn advantage_autocomplete(_ctx: Context<'_>, _: &str) -> impl Iterator<Item = String> {
+    [Advantage::None, Advantage::Beni, Advantage::Maudit]
+        .iter()
+        .map(std::string::ToString::to_string)
+        .collect::<Vec<String>>()
+        .into_iter()
+}
+
+#[poise::command(slash_command)]
+pub async fn roll(
+    ctx: Context<'_>,
+    #[description = "Seuil de réussite"]
+    #[min = 0]
+    #[max = 100]
+    sr: u8,
+    #[description = "Maîtrise"]
+    #[min = 0]
+    #[max = 6]
+    mastery: u8,
+    #[description = "Avantage"]
+    #[autocomplete = "advantage_autocomplete"]
+    advantage: Option<String>,
+) -> Result<()> {
+    let advantage = Advantage::try_from(advantage)?;
+    let roll = Roll::new(sr, mastery, advantage);
+    info!("Received roll {roll:?}");
+    let result: RollResult = roll.into();
+    info!("Result: {result:?}");
+    ctx.say(result.to_string()).await?;
+    Ok(())
+}
diff --git a/src/discord/roll_dice/roll.rs b/src/discord/roll_dice/roll.rs
new file mode 100644
index 0000000..8ba4fa3
--- /dev/null
+++ b/src/discord/roll_dice/roll.rs
@@ -0,0 +1,14 @@
+use super::Advantage;
+
+#[derive(Debug)]
+pub struct Roll {
+    pub sr: u8,
+    pub mastery: u8,
+    pub advantage: Advantage,
+}
+
+impl Roll {
+    pub const fn new(sr: u8, mastery: u8, advantage: Advantage) -> Self {
+        Self { sr, mastery, advantage }
+    }
+}
diff --git a/src/discord/roll_dice/roll_result.rs b/src/discord/roll_dice/roll_result.rs
new file mode 100644
index 0000000..381519a
--- /dev/null
+++ b/src/discord/roll_dice/roll_result.rs
@@ -0,0 +1,73 @@
+use super::{Advantage, Roll, Success};
+
+fn roll_main_dice() -> u8 {
+    rand::random_range(0..=11)
+}
+
+fn roll_mastery_dice() -> u8 {
+    rand::random_range(1..=6)
+}
+
+#[derive(Debug)]
+pub struct RollResult {
+    sr: u8,
+    main_dice: u8,
+    all_main_dice: Vec<u8>,
+    mastery: Vec<u8>,
+    result: u8,
+    success: Success,
+}
+
+impl RollResult {
+    pub fn main_dice_result(main_dice: &[u8], advantage: &Advantage) -> u8 {
+        match advantage {
+            Advantage::None => *main_dice.first().unwrap(),
+            Advantage::Beni => *main_dice.iter().max().unwrap_or(&0),
+            Advantage::Maudit => *main_dice.iter().min().unwrap_or(&0),
+        }
+    }
+
+    fn compute_result(main_dice: &[u8], mastery: &[u8], advantage: &Advantage) -> u8 {
+        let main_dice = Self::main_dice_result(main_dice, advantage);
+        main_dice + mastery.iter().sum::<u8>()
+    }
+}
+
+impl From<Roll> for RollResult {
+    fn from(value: Roll) -> Self {
+        let all_main_dice: Vec<u8> = if value.advantage == Advantage::None {
+            vec![roll_main_dice()]
+        } else {
+            (0..2).map(|_| roll_mastery_dice()).collect()
+        };
+        let mastery: Vec<u8> = std::iter::repeat_with(roll_mastery_dice)
+            .take(value.mastery.into())
+            .collect();
+        let sr = value.sr;
+        let result = Self::compute_result(&all_main_dice, &mastery, &value.advantage);
+        let main_dice = Self::main_dice_result(&all_main_dice, &value.advantage);
+        let success = Success::new(main_dice, result, sr, &mastery);
+        Self {
+            sr,
+            main_dice,
+            all_main_dice,
+            mastery,
+            result,
+            success,
+        }
+    }
+}
+
+impl std::fmt::Display for RollResult {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        let result = format!(
+            "Seuil de réussite : {}
+Dé(s) du destin: {} ({:?})
+Dé(s) de maîtrise: {:?}
+Résultat : {}
+Réussite : {}",
+            self.sr, self.main_dice, self.all_main_dice, self.mastery, self.result, self.success
+        );
+        write!(f, "{result}")
+    }
+}
diff --git a/src/discord/roll_dice/success.rs b/src/discord/roll_dice/success.rs
new file mode 100644
index 0000000..6ced247
--- /dev/null
+++ b/src/discord/roll_dice/success.rs
@@ -0,0 +1,59 @@
+#[derive(Debug)]
+pub enum Success {
+    Failure,
+    Success(SuccessLevel),
+}
+
+impl Success {
+    pub fn new(main_dice: u8, result: u8, sr: u8, mastery: &[u8]) -> Self {
+        let success_level = SuccessLevel::from(mastery);
+        match main_dice {
+            11 => Self::Success(success_level),
+            _ => {
+                if result >= sr {
+                    Self::Success(success_level)
+                } else {
+                    Self::Failure
+                }
+            }
+        }
+    }
+}
+
+impl std::fmt::Display for Success {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        let str = match self {
+            Self::Failure => "échec".to_owned(),
+            Self::Success(success_level) => success_level.to_string(),
+        };
+        write!(f, "{str}")
+    }
+}
+
+#[derive(Debug)]
+pub enum SuccessLevel {
+    Normal,
+    Great,
+    Incredible,
+}
+
+impl From<&[u8]> for SuccessLevel {
+    fn from(value: &[u8]) -> Self {
+        match bytecount::count(value, 6) {
+            0 => Self::Normal,
+            1 => Self::Great,
+            _ => Self::Incredible,
+        }
+    }
+}
+
+impl std::fmt::Display for SuccessLevel {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        let level = match self {
+            Self::Normal => "réussite normale",
+            Self::Great => "grande réussite",
+            Self::Incredible => "très grande réussite",
+        };
+        write!(f, "{level}")
+    }
+}
diff --git a/src/discord/source.rs b/src/discord/source.rs
new file mode 100644
index 0000000..30ec95c
--- /dev/null
+++ b/src/discord/source.rs
@@ -0,0 +1,10 @@
+use color_eyre::eyre::Result;
+
+use super::Context;
+
+#[poise::command(slash_command)]
+pub async fn source(ctx: Context<'_>) -> Result<()> {
+    let message = "Mon code source se situe [là](https://labs.phundrak.com/phundrak/roll-one-ring)";
+    ctx.say(message).await?;
+    Ok(())
+}
diff --git a/src/main.rs b/src/main.rs
index 63f4d8c..a54edc1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,14 +1,17 @@
 #![deny(clippy::all, clippy::pedantic, clippy::nursery)]
 #![warn(missing_docs)]
-#![allow(clippy::module_name_repetitions, clippy::redundant_pub_crate)]
+#![allow(
+    clippy::module_name_repetitions,
+    clippy::redundant_pub_crate,
+    clippy::enum_variant_names
+)]
 #![allow(clippy::unused_async)]
 
 mod discord;
 mod utils;
 
-use poise::serenity_prelude::{self as serenity};
-use tracing::info;
 use color_eyre::Result;
+use tracing::info;
 
 #[tokio::main]
 async fn main() -> Result<()> {