I keep getting killed by dryads in that stupid sanctuary.
At the beginning of the game? You need to use your fire minions to knock them out, and then the spores open once they are knocked out and then use your fire minions to kill the spores to finish them off. The fire minions are in the sanctuary, you slide down a big hill and it leads you to them.
Scroll the mouse wheel to switch between minion types or push the number keys 1 2 3 4 to select the different types (assuming you're playing PC version of course).