It's a racial bonus when you're that race, but it's a spell bonus when you're that race by means of a spell
[You must be logged in to view images. Log in or Register.]
In terms of spell stacking, the regen component fills the same slot as the necro heal, so naturally the higher hp/tick will overwrite the other.
Working as intended i believe, but saying that i never had a necro heal me in classic
[You must be logged in to view images. Log in or Register.]