When defeating a something(most effective on bosses), press either Shift or Ctrl(it doesn't matter) then the up arrow key to increase the damage done on your opponent. Press either Ctrl or Shift and the down arrow key to lessen tha damage on you. Press the shift/Ctrl keys when the opponent is making the symbol. Press the arrow key when the spell is just about to hit you.
|Shift/Ctrl+ up arrow keys||increase damage|
|Shift/Ctrl+down arrow keys||decrease damage|
|Shift+Ctrl+up||use on bosses|
|Shift+Ctrl+down||use on yourself when attacked by a powerful spell|