diff --git a/server/COMBOS.md b/server/COMBOS.md
index 7d865d55..ed80bbc6 100644
--- a/server/COMBOS.md
+++ b/server/COMBOS.md
@@ -71,7 +71,6 @@ Combine `Base Skill Buff + 2 Red & 1 Blue`
 Buff `Base ally targetted skill - significantly increase ally speed`
 
 ### Slow ###
-
 Combine `Base Skill Debuff + 1 Red & 2 Blue`
 Buff `Base ally targetted skill - significantly decrease enemy speed`
 
diff --git a/server/src/vbox.rs b/server/src/vbox.rs
index ad54fd7c..785d6ada 100644
--- a/server/src/vbox.rs
+++ b/server/src/vbox.rs
@@ -16,17 +16,34 @@ use failure::err_msg;
 use account::Account;
 use rpc::{VboxStateParams, VboxAcceptParams, VboxDiscardParams, VboxCombineParams};
 
-#[derive(Debug,Clone,Copy,PartialEq,Serialize,Deserialize)]
+#[derive(Debug,Clone,Copy,PartialEq,Eq,Ord,PartialOrd,Serialize,Deserialize)]
 pub enum Var {
-    Red,
-    Green,
     Blue,
+    Green,
+    Red,
 
     Attack,
     Block,
     Stun,
     Buff,
     Debuff,
+
+    Heal,
+    Throw,
+    Hex,
+}
+
+impl Var {
+    fn is_base(&self) -> bool {
+        match self {
+            Var::Attack |
+            Var::Block |
+            Var::Stun |
+            Var::Debuff |
+            Var::Buff => true,
+            _ => false,
+        }
+    }
 }
 
 #[derive(Debug,Clone,Serialize,Deserialize)]
@@ -56,6 +73,12 @@ impl Vbox {
             (Var::Red, 1),
             (Var::Green, 1),
             (Var::Blue, 1),
+
+            (Var::Attack, 1),
+            (Var::Block, 1),
+            (Var::Buff, 1),
+            (Var::Debuff, 1),
+            (Var::Stun, 1),
         ];
 
         self.free = iter::
@@ -83,6 +106,83 @@ impl Vbox {
 
         Ok(self)
     }
+
+    pub fn combine(&mut self, mut indices: Vec<usize>) -> Result<&mut Vbox, Error> {
+        if indices.len() != 3 {
+            return Err(err_msg("exactly 3 indices required"));
+        }
+
+        if !indices.iter().all(|i| self.bound.get(*i).is_some()) {
+            return Err(err_msg("var missing index"));
+        }
+
+        // have to sort the indices and keep track of the iteration
+        // because when removing the elements the array shifts
+        indices.sort();
+        let mut vars = indices
+            .iter()
+            .enumerate()
+            .map(|(i, index)| {
+                self.bound.remove(*index - i)
+            })
+            .collect::<Vec<Var>>();
+
+        let base_index = vars
+            .iter()
+            .position(|v| v.is_base())
+            .ok_or(err_msg("no base item selected"))?;
+
+        let base = vars.remove(base_index);
+
+        // fold colours into RGB
+        let colours = vars
+            .iter()
+            .fold([0, 0, 0], |mut acc, c| {
+                match c {
+                    Var::Red => acc[0] += 1,
+                    Var::Green => acc[1] += 1,
+                    Var::Blue => acc[2] += 1,
+                    _ => (),
+                };
+                acc
+            });
+
+
+        let new = match base {
+            Var::Attack => match colours {
+                [0,2,0] => Var::Heal,
+                _ => return Err(err_msg("not a combo")),
+            },
+            Var::Block => match colours {
+                [0,2,0] => Var::Heal,
+                _ => return Err(err_msg("not a combo")),
+
+            },
+            Var::Buff => match colours {
+                [0,2,0] => Var::Heal,
+                [1,1,0] => Var::Heal,
+                [0,1,1] => Var::Heal,
+                _ => return Err(err_msg("not a combo")),
+
+            },
+            Var::Debuff => match colours {
+                [0,2,0] => Var::Heal,
+                _ => return Err(err_msg("not a combo")),
+
+            },
+            Var::Stun => match colours {
+                [2,0,0] => Var::Throw,
+                [0,0,2] => Var::Hex,
+                _ => return Err(err_msg("not a combo")),
+
+            },
+            _ => return panic!("wrong base {:?}", base),
+        };
+
+        self.bound.push(new);
+
+        Ok(self)
+    }
 }
 
 pub fn vbox_create(vbox: Vbox, tx: &mut Transaction, account: &Account) -> Result<Vbox, Error> {
@@ -165,12 +265,27 @@ pub fn vbox_discard(params: VboxDiscardParams, tx: &mut Transaction, account: &A
 
 pub fn vbox_accept(params: VboxAcceptParams, tx: &mut Transaction, account: &Account) -> Result<Vbox, Error> {
     let mut vbox = vbox_get(tx, params.game_id, account)?;
-
     vbox.accept(params.index)?;
-
     return vbox_write(vbox, tx);
 }
 
 pub fn vbox_combine(params: VboxCombineParams, tx: &mut Transaction, account: &Account) -> Result<Vbox, Error> {
-    return vbox_get(tx, params.game_id, account)
+    let mut vbox = vbox_get(tx, params.game_id, account)?;
+    vbox.combine(params.indices)?;
+    return vbox_write(vbox, tx);
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn combine_test() {
+        let mut vbox = Vbox::new(Uuid::new_v4(), Uuid::new_v4());
+        vbox.bound = vec![Var::Attack, Var::Green, Var::Green];
+        vbox.combine(vec![1,2,0]).unwrap();
+
+        println!("{:?}", vbox);
+        assert_eq!(vbox.bound[0], Var::Heal);
+    }
+}
\ No newline at end of file