I added some more skills, each one bringing a new feature in the skill system :
"Cyclone" is the first skill that can deal damages to several creatures. It hits every adjacent opponent.
"Sever artery" and "Chabal's bash" respectively generate "bleeding" and "stunned" condition on the target.
"You will die" is the first buffing skill. It regenerates some stamina.
Now, skills are greyed when you don't have enough stamina to cast them (like the Cyclone skill in following screenshot).