For the Atropal Scion, I'll vote LA +0 for the mess that is progressing it. There's definitely some work you can do with other boosting mechanics, but when the general consensus is that you're going Ur-Priest or else be stuck dumpster-diving, the thing's really going to hurt in much of actual play.

Quote Originally Posted by liquidformat View Post
Take a look at the high level outsiders from MM most of them are quite powerful for their RHD and are a good baseline for what type of abilities a monster should have to be appropriate for its ECL.
The issue is that they are in fact powerful for the RHD, without equipment. Most of the low-Epic outsiders can readily eat LA ratings because of this, because they have the numbers you expect from a low-Epic character once you correct the feats, before you put on the gear that will stack with basically everything they do innately in some capacity. The exercise in question is measuring creatures with RHD well in excess of CR such that PC itemization and feat selection alongside "hooks" for progression readily "fill in" the difference to generate a reasonable LA +0 character.