Recently I came up with an idea to build a charachter around elemental skins from polymorph school. The initial plan was to play as an elf-elementalist who can change his skin type and then use a flesh sacrifice to get a corresponding surface and an AP refund. But after using skin skills your charachter still bleeds blood from flesh sacrifice. But given the description of skin skills I guess you should bleed your new "blood type" - fire/ice/poison/electrified water. Please devs! I am trying to make some unusable skills work, I need some help from above!

Upd: Just found out there is a mod that fixes that interaction, but I would be really happy to see it implemented officialy in an upcoming patch.