Demiurge, 7th Floor Guardian

Flying
All Demons, Devils, and Imps gain "{u}{b}{r}{t}: Counter target spell or ability."
"If you wish, I will immediately bring the armies of Nazarick and take this jewel box. Presenting this gift
to my beloved Momonga-sama would be Demiurge's greatest honor." - Demiurge to Ainz, formerly
Momonga.