Good start to what the future will bring...

This is a bit of what I imagine. You are a BLM and your over zealous casting has caused your hate to go so high that now the beast in front of you has aggro on you.

You see him b-lining right for you, but you are just far enough to cast a quick spell. ICE Wall!!!! A wall of ice appear in the spot you zone target. The beast runs into it getting a deep chill ice damage. Or restricted from passing further till the wall is destroyed.

The Ice Wall can be like the needles from Ifrit that stay there for a limited time unless destroyed by attacking.