New spells - any of them decent ?

[Boozie]

Originally Posted by torquemada

Pheonix, it's rediculously powerful.
Healing, really cheap and really nice damage early on versus undead also lvl3 cures poison and plague.
Haste lv3 has mass effect.
Slow
Weakness(the one that lowers defence) nice vs black knights and enemies with high defence.
Blizzard it will end up being your number 1 spell
Greasy mist, very nice in combination with pheonix.

I meant more specifically for the spider boss itself what should I look for/spend runes on.