Humans in WH40k have a multitude of artificial organs and limbs. From the Rogue Trader Core Rulebook, page 148:
- Bionic Arm
- Bionic Locomotion (Legs, Hips, Pelvis, etc.)
- Bionic Respiratory System
There are also several Space Marines and Imperial Guard figures with artificial limbs.
These Iron Hands with an astartes with artificial legs, bottom centre. Right of it is a Space Marine with an artificial hand:
Skitarii Squad with many replaced limbs (as an example that it is also possible for humans):
It is also known that Orks replace limbs:
However, I can't remember ever having seen an Eldar with artificial limbs, neither Dark Eldar nor Craftworld Eldar. This would indicate for me that they have a way to regrow cut off or otherwise destroyed limbs. I don't see any problems with the Dark Eldar, given they have Haemonculi that can basically twist flesh at their free will.
Same with the T'au. Can't remember having seen a T'au with any artificial limbs. While researching this, some reddit / quora users described that T'au can clone limbs:
Several of the Tau books mention them cloning limbs it's stated they are given a prosthetic, but the prosthetic is usually mentioned as being just at as strong as the base limb, a couple mentioned they viewed the prosthetic as a vile necessity.
From this Reddit Answer
But with no direct quote from a book. Also, Lexicanum has an article on Imperial bionics and Ork Bioniks but nothing similar about Eldar or T'au.
So, has it ever been described how Eldar (specially Craftworld Eldar) and T'au replace destroyed limbs?