[b19] Miscellaneous Dark Vision bugs

[eronarn]

Dark Vision applies on the overworld, where it lets you see enemies through mountains.

Dark Vision at level 3+ is supposed to increase the damage you deal to enemies in darkness. It doesn't seem to actually work for the Doomed abilities I've tried it with, though.

At level 4+ the ability scales to 12+ range. If this doesn't exceed the new cap of 10, it's useless to raise it that high. If it does, it's kind of broken.