Yeah. I think healing magic can't cure poisonings, for those you need potions... or curses, for those you need siphon magic.

[That's what he learned on Avalon, in any case. Ellipsa evidently has a completely different magic system; for a start each season has only one element allocated to it, whereas on Avalon elemental mages - and only those - could learn to control all elements.]

And then there's our "mana" limitation, of course. If it's used up we can't do anything until we get some rest.