Added the unique skill "Poison Weapon"

The unique skill "Poison Weapon" has been added to Kempf. Holders of this skill will poison opponents regardless of the weapon used when dealing damage with their attacks.

I gave him this skill because the poison weapon is Kempf's symbol. This skill is also effective when the unit has become an ally, making it the only allied unit that can poison an enemy. You can also use Bolting to poison them from a distance and wait for them to take damage.

It is ineffective if the opponent is in throne, gate, or seal terrain.
If you use a weapon with other additional effects or activate Sol, those take precedence and this skill will not activate.