Talk:Doppelgänger/@comment-2.121.136.83-20171010120017/@comment-2A02:C7D:9E65:E300:251B:ECE6:8A28:97E2-20171010121609

Ainz says "Since it was a monster Doppelganger, it was not very strong"

Then it says:

"Even when transformed, it could only copy level forty abilities, and it was even weaker without transformation. It’s more potent abilities was how it could freely make use of karma-restricted gear. That said, it could not use magic items above relic-class"

So only monster type Doppelgangers can do this.