my thoughts:
+1
EGGSHELL CRACKS ALLOWED:
points:
1 point(excluding one-point queen) = 12 cracks allowed
3 points = 12 cracks allowed
5 points = 10 cracks allowed
7 points = 8 cracks allowed
9 points(including one-point queen) = 10 cracks allowed
12 points(amazon) = 12 cracks allowed
HEALING:
points:
1 point(excluding one-point queen) = no heal(since they hardly ever move)
3 points = heals after 7 moves staying in one spot
5 points = heals after 7 moves staying in one spot
7 points = heals after 6 moves staying in one spot
9 points(including one-point queen) = heals after 5 moves staying in one spot
12 points = heals after 4 moves staying in one spot
PROMOTION:
when pawns promote they reset their cracks to the amount of cracks of the piece they promoted to.
+100
Maybe the "eggshell" durability should be a bit more lenient
Right, similar to the N-Check gamerule, the durability values could be set to a custom number. In my examples, I put 8, but it could be set to any value.