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Yes,
so long as it doesn't make the attack one-kill-hit
and depends on whether your opponent has it. Damage crystals and scrolls are fine, except master scroll as it is too powerful.

Stuns are fine, the rest isn't.

Worry not! We shall make the times fit you as much as we possibly can ~

UPDATE:
Wyverns have also been banned.

http://i.imgur.com/rUIIgqQ.png
You were peacefully resting in New Trismus, minding your own business after a long day of battling and crafting. In the comfortable sunlight, you were about to doze...