Just like those MMORPG games with action-bar one could craft the abilites once class is; tank, dps, healer. You have the weapons and the armor, realms with mobs and bosses, and you can upgrade your action-bar abilities you crafted with new ones from the drops from bosses and such. I think it would be a good idea for a Minecraft mod. Any positive and/or negative feedbacks for this idea please.