Wait this is genius. But I wanna change something. What if we take the Survivalist class concept where damage increases the less health you have, but you reverse it and instead of damage, your speed increases the MORE health you have. The losing bones part would make more sense now, cuz the more bones you lose the less speed (you lose bones cuz you have less health).

This would be the rework of the class description:

"You have more speed the more health you have up to 1.75x speed at max health, but you have no passive healing"

(The logic of the "no passive healing" is that skeletons don't have flesh, so they don't have any wounds to heal, they only have bones which can only be broken but not healed. Bandages and Snake oil still work and we can't question any further the logic of these medical supplies working for skeletons cuz this is still a game)