We need an epic Oonga from isle of the ape. I know Oonga is already in the CC but his origonal version could have thrown down with the 1e Tarrasque.
Erm, the version in the Creature Catalog is already epic - it's got Epic Feats to prove it. I will agree that Oonga and his Gargantuan Ape kin are bit underwhelming
in the CC conversions, especially considering Oonga is supposed to solo against a high-level party.
However, it's already been converted for the CC in 3.5 and I'm reluctant to redo it, especially since there's official 3.5 stats for an "Island Ape" in Expedition to the Ruins of Greyhawk (2007). Unfortunately the latter is even more underwhelming, basically being a glorified Dire Ape with a couple of points of fast healing. It's only CR 12.