Dinosaur, Battletitan

This about sums it up.

Seriously though: the battletitan is awesome, but it's also got 36 RHD, and it's basically the common slash-grab-swallow monster except intended for much higher levels of play (where it fails to perform well, in case you were wondering).

No matter how well that 42 strength gets utilized, no matter how cleverly those epic feats are used, in the end a battletitan will fail to perform as expected at ECL 36: a place when PCs are supposed to be capable of handling multiple demon lords at once.

Perhaps the easiest -0 LA I've ever issued.