Which spells do folks consider worth learning or upgrading ?

[Metathron]

Originally Posted by phoenixreborn

I'm rather fond of Summon Phoenix. I got it pretty early, level 9 and upgraded it to third level. It helps with enemy shooters. I also like that it rebirths.

I quite like it too, but on the other hand I find it dissappointing that the phoenix is too weak even at level 3. Maybe I expected more from the spell, especially for 30 mana (playing as warrior).