Rustforged (5e Race Variant)
From D&D Wiki
Rustforged are those sentient constructs assembled in a hurry, without proper supplies, or with minimal practice. While they function largely the same, there are obvious flaws in their designs. Some Rustforged are even characterized by a menagerie of spare or rusty parts.
Adapted from Eberron Warforged
Design Flaw You cannot regain hitpoints from a spell unless the caster is touching you.
Easy Come, Easy Go While at 0 hit points you cannot be stabilized with a medicine check or a healer's kit.
-Tinker's tools work in place of a healer's kit, but no uses are taken.
-Alternatively, another creature within 5 feet of you can use their action to make an Intelligence check with a DC of 13 and use at least 5 gp of metal, gears, or other supplies to bring you back to 1 hit point.
Quick Modification When you finish a short or long rest, you can gain proficiency in one set of artisan's tools. This lasts until you use this ability next.