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

Formula: Enchant Gloves - Advanced Herbalism

NPC	Level	Zone	Chance
Swampwalker	38 - 39	Swamp of Sorrows	2.08%
Molt Thorn Rare	42	Swamp of Sorrows	1.90%
Swampwalker Elder	39 - 40	Swamp of Sorrows	1.84%
Tangled Horror	40 - 41	Swamp of Sorrows	1.82%
Mire Lord	42	Swamp of Sorrows	1.64%