Boss

Grommaur, the Obsidian Vein

Grommaur, the Obsidian Vein is a boss of the melee type found in Veio de Obsidiana.

Lore

Grommaur, the Obsidian Vein, is the boss of Veio de Obsidiana, a dragon so vast that the mountain folk believe he is the mountain itself. His obsidian veins run through the surrounding rock like roots, and they say he feels every step taken within his domain.

He fights up close with geological force, every movement shaking the caverns. When the veins glow across his whole body, he brings down Brutal Strike, a blow that shatters the stone in waves. Facing him is facing the earth itself.

Special attack

Brutal Strike: every 4 attacks, Grommaur, the Obsidian Vein hits for 161% of its normal damage. Loot focus: Balanced (Advanced).

Where Grommaur, the Obsidian Vein appears

Map	Role	Requirement	HP	Damage	Defense	EXP	Gold
Veio de Obsidiana	Boss	Level 350 • 800 Resets	140,000,000	29,000	37,054	23,194	5,781

Reference values, without Reset. With each Reset the monsters get stronger and give bigger rewards.

Drops

As a boss, Grommaur, the Obsidian Vein drops equipment up to Ancient, sometimes from the family after the one the map's monsters drop, and has a higher chance of jewels (Bless, Soul, Chaos). See the item list by class on the map's page: Veio de Obsidiana.

Drop chances in Veio de Obsidiana

The chance of each drop per defeated enemy, the same as the in-game Codex (tap the monster and see DROPS). These are the Normal mode chances, without events.

Drop	Chance per kill
Equipment	100%
Blacksmith Scroll	2%
Jewel of Bless (PT)	0.78% (1 in 128)
Jewel of Soul (PT)	0.52% (1 in 193)
Jewel of Chaos (PT)	0.0072% (1 in 14,000)
Taming Seal (PT)	0.15% (1 in 667)
Ascension Core	1.5%
Loch's Feather (PT)	0.5% (1 in 200)

Equipment rarity

When a piece of equipment drops, this is the chance of each rarity:

Rarity	Chance per kill
Uncommon	87%
Rare	12%
Epic	0.3% (1 in 333)
Legendary	0.008% (1 in 12,000)
Ancient	0.001% (1 in 100,000)

Special enemies pay more: the Elite drops an item 38% of the time, the Champion 70% and the Ancient Monster 100%; Champion and Ancient Monster raise the item's rarity by 1 level. The jewel chance is 2× on the Elite, 4× on the Champion and 8× on the Ancient Monster. Each Reset also raises the jewel chance a little. See Special enemies (PT).