Added the unique skill "Sneak Attack"

The unique skill "Sneak Attack" has been added to Ortov. When the holder of this skill attacks an opponent who is unable to counterattack, their critical rate is increased.

This skill name is inspired by a common occurrence on the map where Ortov appears: Hasn't everyone experienced trying to save the children, only for a Bolting or Meteor to suddenly appear and kill them? It was a real sneak attack.

Increasing the hit rate would make countermeasures impossible, so I opted to increase the critical rate instead. If the opponent possesses the Crusader's Scroll, his critical rate will drop to 0, even with this skill's boost. Therefore, it is advisable to have units within Ortov's attack range carrying the scroll.

Since ranged attacks prevent counterattacks, this skill will always be active when attacking with a ranged weapon.