[Endoperez]

Blesses not affecting pretender was intentional, but the effect of Nature on regeneration could be considered buggy. It works on regeneration in some cases, but not in nearly all cases. If Nature boosted the regeneration on Green Dragons and Great bulls and whatever else, regardless of the source, they could be actually useful. (Well, dragons already are, but not the Great Bulls and many other monsters). Ring of Regeneration on a N6-9 beast-god would be enough to give 100+ hp regen/turn.

If anyone else is interested, read the bug thread. Hit points don't regenerate when shape changes, basically.