What is the strongest minion a necromancers Command undead ability can control?

I am currently a lv13 Necromancer and my 14th lv ability lets me control 1 undead. I want to know what the strongest official undead creature is with an int of 11 or less so I can start tracking 1 down now. I’ve seen this question asked before but I haven’t found an answer that doesn’t include using the spell feeblemind which is something I don’t have access to. Just to clarify by strongest I mean I’m just looking for the highest CR