So for example, let’s say in order to oversoul a wolf type monster, you have to defeat 15 wolf-type enemies. It doesn’t matter which enemy is killed, just the type. After you kill 15 of them, the next wolf type creature you face will oversoul. If you run away or whatever, you will keep encountering a oversouling wolf-type enemy until you defeat it. Then the counter resets and it will take another 15 kills before that type oversouls again.
Capisci? 🙂