Larran's Grotto (COS Zone)  

Type	Rec Level	Rec Power (Heroic)	Common Mobs	Bosses	Quests	Dungeon Objectives	Vanquish
							Common Drops	Rare Drops
Larran's Grotto					Accessible from: Heartland Road
	13+		Chittle Larva Orbolg Foreman Orbolg Sapper Orbolg Scout	Irongrub (13)	Ambush at the Bazaar [Optional] Coal Running	670 990   Kill Irongrub
Flywheel Shaft					Accessible from: Larran's Grotto
	14+		Chittle Larva Orbolg Foreman Orbolg Sapper Orbolg Scout	The Saboteur (14)	[Optional] Coal Running	740 1190   Kill The Saboteur
Larran's Grotto Boss Raid					Accessible from: Larran's Grotto
	15	2556 (3357)	Orbolg Sapper Orbolg Scout	Orbolg Spelunker (15)	[Vanquisher] Motormined [Challenge] Heroic - Motormined	Defeat Orbolg Spelunker

City of Steam Wikibase™ Zones

Each Boss Raid Challenge dungeon that you complete will grant rewards in addition to any items you find within it.

• Normal mode: Transmuter Orbs, Mastery Points, Expertise Points, Rare Materials Boxes, EXP
• Vanquish mode: EXP, Shillings, Mastery Points, Expertise Points. Note that EXP is higher than Normal mode to compensate for the loss of kill EXP that you do not get in this mode.
• Heroic mode: Rare Materials Boxes, Orange Material, Shillings