crab, turtle and fiendflesh is finite/“limited absorb”, it applies after resist and armour, but before regular %absorb and flat
in a dmg calc of 10k incoming dmg and 80resist
2k dmg left
turtle absorbs 2k - turtle has 4k absorb left
(your regular Maiven %absorb and flat didn’t get used)
since there are some conflicting older posts here is the updated order