[Arralen]

It's the old problem with the gold cost, unit stats and mounts. In general, you pay somewhat for getting a mounted unit. With some units, you pay for a unit with double hitpoints (1st and 2nd form), but as you only get them one after the other, price increase isn't that big. (=> Mictlan animal warriors, Serpent Cataphracts)

But with the Black Hunters, you basically pay as if you had a 12+45HP, size 6 unit with 4 attacks and poison resistance all time long, not only after the rider dies and you're left with an afflicted spider.

There's one exception, though: Jotunheims Moose Riders. Instead of 2x 8HP, they get about 45 HP - from the Moose.

So there are 2 alternatives:
Price the Black Hunters similar to other nations 2-form blessable units.
Or add a %tage of the mounts HP to the first form. E.g. a knight might get +5..+7 from the horse, the Black Hunters would get +20HP. Some mounts hitpoints might be difficult to figure out, maybe +5HP per point of size the mounted unit is bigger than the unmounted rider would be as a general rule (what would not acount for exceptionally sturdy or fragile mounts, though)

HP values might be off somewhat, I'm too lazy to look them up, and I don't know them by heart. hmmm, should I ?