So you think Lizard should be able to remove stunned, blinded, frozen, crippled, cursed, terrified and knocked down all at once? At the expense of reducing a bit of Constitution?
That's wrong. You can't remove Stunned, Frozen, Terrified or Knocked Down because those are hard CC
and you can't act to activate the skill to remove them. Hello?
Fire Breath isn't great but nor is Encourage. You don't have to use them but neither are they completely useless. Elf should be the same - a simple swap of CON for damage would do (if CON did anything). Perhaps charging 1AP would also bring it more into line with other traits.
If it doesn't already, Encourage should scale up with level.
Adding a 1 AP cost to Flesh Sacrifice seems like a good idea. Even if it still grants the +1 AP on use, that would be better than getting an extra AP for free.
Problem is constitution is pointless at the moment. If you get stunned and/or knocked down for 2 rounds and don't get up again you will die - it doesn't matter how much constitution you have.
The problem with CON is a separate issue which should be addressed so that CON becomes something important. Once CON becomes important, then it will matter if you lose some of it thanks to an ability.
If you could shed your skin you may as well play glass cannon lizard and win every time.
The skill has a thing called a "cooldown". That means you can't use it all the time. Maybe the cooldown could be 5 or 6 turns.