Items, NPCs, quests, objects and spells of patch 1.12.1, read live from the realm itself.

Rusted Engineering Parts

NPC Level Zone Chance

Drysnap Crawler 33 - 34 Desolace 0.02%

Drysnap Pincer 34 - 35 Desolace 0.02%
Object Zone Chance

Shellfish Trap Desolace 1.40%

NPC	Level	Zone	Chance
Drysnap Crawler	33 - 34	Desolace	0.02%
Drysnap Pincer	34 - 35	Desolace	0.02%