diff --git a/src/commands/cthulhu.rs b/src/commands/cthulhu.rs
index 508f626..9f18074 100644
--- a/src/commands/cthulhu.rs
+++ b/src/commands/cthulhu.rs
@@ -11,7 +11,7 @@ impl Command for CthRoll {
         "roll percentile pool"
     }
 
-    async fn execute(&self, ctx: &Context) -> Execution {
+    async fn execute(&self, _ctx: &Context) -> Execution {
         //TODO this will be converted to a result when supporting variables.
         let roll = self.0.roll();
         let plain = format!("Roll: {}\nResult: {}", self.0, roll);
@@ -25,3 +25,22 @@ impl Command for CthRoll {
 }
 
 pub struct CthAdvanceRoll(pub AdvancementRoll);
+
+#[async_trait]
+impl Command for CthAdvanceRoll {
+    fn name(&self) -> &'static str {
+        "roll percentile pool"
+    }
+
+    async fn execute(&self, _ctx: &Context) -> Execution {
+        //TODO this will be converted to a result when supporting variables.
+        let roll = self.0.roll();
+        let plain = format!("Roll: {}\nResult: {}", self.0, roll);
+        let html = format!(
+            "<p><strong>Roll:</strong> {}</p><p><strong>Result</strong>: {}</p>",
+            self.0, roll
+        );
+
+        Execution { plain, html }
+    }
+}
diff --git a/src/commands/parser.rs b/src/commands/parser.rs
index 1275af2..482a5b6 100644
--- a/src/commands/parser.rs
+++ b/src/commands/parser.rs
@@ -2,14 +2,14 @@ use crate::cofd::parser::{create_chance_die, parse_dice_pool};
 use crate::commands::{
     basic_rolling::RollCommand,
     cofd::PoolRollCommand,
-    cthulhu::CthRoll,
+    cthulhu::{CthAdvanceRoll, CthRoll},
     misc::HelpCommand,
     variables::{
         DeleteVariableCommand, GetAllVariablesCommand, GetVariableCommand, SetVariableCommand,
     },
     Command,
 };
-use crate::cthulhu::dice::{DiceRoll, DiceRollModifier};
+use crate::cthulhu::parser::{parse_advancement_roll, parse_regular_roll};
 use crate::dice::parser::parse_element_expression;
 use crate::error::BotError;
 use crate::help::parse_help_topic;
@@ -57,13 +57,15 @@ fn parse_pool_roll(input: &str) -> Result<Box<dyn Command>, BotError> {
 }
 
 fn parse_cth_roll(input: &str) -> Result<Box<dyn Command>, BotError> {
-    let roll = DiceRoll {
-        target: 50,
-        modifier: DiceRollModifier::Normal,
-    };
+    let roll = parse_regular_roll(input)?;
     Ok(Box::new(CthRoll(roll)))
 }
 
+fn parse_cth_advancement_roll(input: &str) -> Result<Box<dyn Command>, BotError> {
+    let roll = parse_advancement_roll(input)?;
+    Ok(Box::new(CthAdvanceRoll(roll)))
+}
+
 fn chance_die() -> Result<Box<dyn Command>, BotError> {
     let pool = create_chance_die()?;
     Ok(Box::new(PoolRollCommand(pool)))
@@ -121,7 +123,10 @@ pub fn parse_command(input: &str) -> Result<Option<Box<dyn Command>>, BotError>
             "del" => parse_delete_variable_command(&cmd_input).map(|command| Some(command)),
             "r" | "roll" => parse_roll(&cmd_input).map(|command| Some(command)),
             "rp" | "pool" => parse_pool_roll(&cmd_input).map(|command| Some(command)),
-            "cthroll" => parse_cth_roll(&cmd_input).map(|command| Some(command)),
+            "cthroll" | "cthRoll" => parse_cth_roll(&cmd_input).map(|command| Some(command)),
+            "cthadv" | "cthARoll" => {
+                parse_cth_advancement_roll(&cmd_input).map(|command| Some(command))
+            }
             "chance" => chance_die().map(|command| Some(command)),
             "help" => help(&cmd_input).map(|command| Some(command)),
             // No recognized command, ignore this.
diff --git a/src/cthulhu.rs b/src/cthulhu.rs
index 99ad3e8..8406843 100644
--- a/src/cthulhu.rs
+++ b/src/cthulhu.rs
@@ -1 +1,2 @@
 pub mod dice;
+pub mod parser;
diff --git a/src/cthulhu/dice.rs b/src/cthulhu/dice.rs
index 0143d47..6449a9a 100644
--- a/src/cthulhu/dice.rs
+++ b/src/cthulhu/dice.rs
@@ -1,7 +1,7 @@
 use std::fmt;
 
 /// A planned dice roll.
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, Debug, PartialEq)]
 pub struct DiceRoll {
     pub target: u32,
     pub modifier: DiceRollModifier,
@@ -9,14 +9,14 @@ pub struct DiceRoll {
 
 impl fmt::Display for DiceRoll {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let message = format!("target: {}, modifiers: {}", self.target, self.modifier);
+        let message = format!("target: {}, with {}", self.target, self.modifier);
         write!(f, "{}", message)?;
         Ok(())
     }
 }
 
 /// Potential modifier on the die roll to be made.
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, Debug, PartialEq)]
 pub enum DiceRollModifier {
     /// No bonuses or penalties.
     Normal,
@@ -37,11 +37,11 @@ pub enum DiceRollModifier {
 impl fmt::Display for DiceRollModifier {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         let message = match self {
-            Self::Normal => "none",
-            Self::OneBonus => "one bonus",
-            Self::TwoBonus => "two bonus",
-            Self::OnePenalty => "one penalty",
-            Self::TwoPenalty => "two penalty",
+            Self::Normal => "no modifiers",
+            Self::OneBonus => "one bonus die",
+            Self::TwoBonus => "two bonus dice",
+            Self::OnePenalty => "one penalty die",
+            Self::TwoPenalty => "two penalty dice",
         };
 
         write!(f, "{}", message)?;
@@ -100,6 +100,7 @@ pub struct RolledDice {
     target: u32,
 
     /// Stored for informational purposes in display.
+    #[allow(dead_code)]
     modifier: DiceRollModifier,
 }
 
@@ -141,15 +142,25 @@ impl fmt::Display for RolledDice {
 
 /// A planned advancement roll, where the target number is the
 /// existing skill amount.
+#[derive(Clone, Copy, Debug, PartialEq)]
 pub struct AdvancementRoll {
     /// The amount (0 to 100) of the existing skill. We must beat this
     /// target number to advance the skill, or roll above a 95.
     pub existing_skill: u32,
 }
 
+impl fmt::Display for AdvancementRoll {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let message = format!("advancement for skill of {}", self.existing_skill);
+        write!(f, "{}", message)?;
+        Ok(())
+    }
+}
+
 /// A completed advancement roll.
 pub struct RolledAdvancement {
     existing_skill: u32,
+    num_rolled: u32,
     advancement: u32,
     successful: bool,
 }
@@ -173,6 +184,27 @@ impl RolledAdvancement {
     }
 }
 
+impl fmt::Display for RolledAdvancement {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let message = if self.successful {
+            format!(
+                "success! new skill is {} (advanced by {}).",
+                self.new_skill_amount(),
+                self.advancement
+            )
+        } else {
+            format!("failure! skill remains at {}", self.existing_skill)
+        };
+
+        write!(
+            f,
+            "rolled {} against {}: {}",
+            self.num_rolled, self.existing_skill, message
+        )?;
+        Ok(())
+    }
+}
+
 trait DieRoller {
     fn roll(&mut self) -> u32;
 }
@@ -248,12 +280,14 @@ impl AdvancementRoll {
 
         if percentile_roll < self.existing_skill || percentile_roll > 95 {
             RolledAdvancement {
+                num_rolled: percentile_roll,
                 existing_skill: self.existing_skill,
                 advancement: roller.roll() + 1,
                 successful: true,
             }
         } else {
             RolledAdvancement {
+                num_rolled: percentile_roll,
                 existing_skill: self.existing_skill,
                 advancement: 0,
                 successful: false,
diff --git a/src/cthulhu/parser.rs b/src/cthulhu/parser.rs
index 7b7f9fd..32f88a7 100644
--- a/src/cthulhu/parser.rs
+++ b/src/cthulhu/parser.rs
@@ -1,16 +1,91 @@
-use super::dice::{AdvancementRoll, DiceRoll};
-use crate::error::BotError;
-use combine::error::StringStreamError;
-use combine::parser::char::{digit, letter, spaces, string};
-use combine::{choice, count, many, many1, one_of, Parser};
+use super::dice::{AdvancementRoll, DiceRoll, DiceRollModifier};
+use crate::parser::DiceParsingError;
 
-pub fn parse_roll(input: &str) -> Result<DiceRoll, ParsingError> {
-    Ok(DiceRoll {
-        target: 50,
-        modifier: DiceRollModifier::Normal,
-    })
+//TOOD convert these to use parse_amounts from the common dice code.
+
+pub fn parse_regular_roll(input: &str) -> Result<DiceRoll, DiceParsingError> {
+    let input = input.trim();
+    let target: u32 = input.parse().map_err(|_| DiceParsingError::InvalidAmount)?;
+
+    if target <= 100 {
+        Ok(DiceRoll {
+            target: target,
+            modifier: DiceRollModifier::Normal,
+        })
+    } else {
+        Err(DiceParsingError::InvalidAmount)
+    }
 }
 
-pub fn parse_advancement_roll(input: &str) -> Result<AdvancementRoll, ParsingError> {
-    Ok(AdvancementRoll { existing_skill: 50 })
+pub fn parse_advancement_roll(input: &str) -> Result<AdvancementRoll, DiceParsingError> {
+    let input = input.trim();
+    let target: u32 = input.parse().map_err(|_| DiceParsingError::InvalidAmount)?;
+
+    if target <= 100 {
+        Ok(AdvancementRoll {
+            existing_skill: target,
+        })
+    } else {
+        Err(DiceParsingError::InvalidAmount)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+
+    use super::*;
+
+    #[test]
+    fn regular_roll_accepts_single_number() {
+        let result = parse_regular_roll("60");
+        assert!(result.is_ok());
+        assert_eq!(
+            DiceRoll {
+                target: 60,
+                modifier: DiceRollModifier::Normal
+            },
+            result.unwrap()
+        );
+    }
+
+    #[test]
+    fn regular_roll_accepts_whitespacen() {
+        assert!(parse_regular_roll("60     ").is_ok());
+        assert!(parse_regular_roll("   60").is_ok());
+        assert!(parse_regular_roll("   60    ").is_ok());
+    }
+
+    #[test]
+    fn advancement_roll_accepts_whitespacen() {
+        assert!(parse_advancement_roll("60     ").is_ok());
+        assert!(parse_advancement_roll("   60").is_ok());
+        assert!(parse_advancement_roll("   60    ").is_ok());
+    }
+
+    #[test]
+    fn advancement_roll_accepts_single_number() {
+        let result = parse_advancement_roll("60");
+        assert!(result.is_ok());
+        assert_eq!(AdvancementRoll { existing_skill: 60 }, result.unwrap());
+    }
+
+    #[test]
+    fn regular_roll_rejects_big_numbers() {
+        assert!(parse_regular_roll("3000").is_err());
+    }
+
+    #[test]
+    fn advancement_roll_rejects_big_numbers() {
+        assert!(parse_advancement_roll("3000").is_err());
+    }
+
+    #[test]
+    fn regular_roll_rejects_invalid_input() {
+        assert!(parse_regular_roll("abc").is_err());
+    }
+
+    #[test]
+    fn advancement_roll_rejects_invalid_input() {
+        assert!(parse_advancement_roll("abc").is_err());
+    }
 }
diff --git a/src/parser.rs b/src/parser.rs
index 5d74687..7285ce6 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -8,7 +8,7 @@ use thiserror::Error;
 //******************************
 #[derive(Debug, Clone, Copy, PartialEq, Error)]
 pub enum DiceParsingError {
-    #[error("invalid amount of dice")]
+    #[error("invalid amount")]
     InvalidAmount,
 
     #[error("modifiers not specified properly")]