What does Quickcast skill do?
This allows you to cast any spell with very little chance of being interrupted (e.g. when an enemy is hitting you) & cast it at half the casting time. First of all put the icon for this skill (which is on the Abilities Panel) onto your hotkey bar. Then whenever you want to ‘Quickcast’ a spell, press the quickcast icon first & then the spell you want to cast immediately after. You can only use this ability every 30 seconds. The spell will cost 2x its normal power cost when you ‘Quickcast’ it though. You are currently able to ‘Quickcast’ a spell when you have no power left which is handy in emergencies. This is supposedly a bug in the game so it may get fixed at some point.