What's the most dangerous Spell?

Thetis Blessing
I think even wish falls behind this spell in terms of epic world-wide disaster potential. Especially if it's a big game with a lot of enthusiastic opportunists who want to take advantage of the spell being cast.

[Valandil]

Maybe true...
How about astral corruption?
Burden of Time?

[Cor2]

Autochthon said:

This has possibilities as an offensive tactic

Step 1: Script Cast Communion Slave/Master
Step 2: Script Master to Phoenix Pyer, Slaves to Attack Nearest
Step 3: ...
Step 4: Profit

I've seen people come up with similar tactics in a TT game called Warmachine.

Times like that make me wish Dom3 had a Replay feature like Dawn of War. We could post them in a threat called Dom3: Greatest Misses

Step3.... cast summon earth power
step 4... cast invonerablitiy
step 5 attack
step6 kaboom!