a YORICK bug on ARAM

I'll keep this short. I got Yorick, on ARAM. about halfway through the game, I noticed that two invulnerable ghouls were following me; omens of pestilence. they would slow and damage enemies near them, but they did not have health bars and though the enemies could attack them, they were unkillable. This was hilarious. ly frustrating for the other team.

I really have no idea how to reproduce this. I just know that it exists. Pardon me.