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

Tunnel Rat Ear

NPC	Level	Zone	Chance
Tunnel Rat Vermin	10 - 11	Loch Modan	80.0%
Tunnel Rat Scout	10 - 11	Loch Modan	80.0%
Tunnel Rat Geomancer	12 - 13	Loch Modan	80.0%
Tunnel Rat Digger	12 - 13	Loch Modan	80.0%
Tunnel Rat Forager	11 - 12	Loch Modan	80.0%
Tunnel Rat Surveyor	14	Loch Modan	80.0%
Tunnel Rat Kobold	11 - 12	Loch Modan	80.0%