20? pshh make it 100 and we gotta deal i want skyscraper bosses that you need a spaceship to kill and if you wanna tank it on the ground go for it the BIGGER the challenge the better XD
Go bigger and better, stop saying no and embrace the OH SHIT! moment. The Guta in Reach was a highlight and a massive beastie, while the Scarab has burned itself into collective as one of the most favorite parts in Halo. Massive enemies a go.