Bestiary entry from the Clan Primer:
Bestiary Observations
“Facer transformed by a strong Mist. This strain, as yet unrecorded in the Camp annals, is hunted in the Tomb of Raithwall.”
Drops
| Common - (40-55%) |  Solid Stone |
| Uncommon - (25-40%) | (Nothing) |
| Rare - (3-12%) |  Betelgeuse |
| Very Rare - (1-5%) | (Nothing) |
| With Monograph: | Arcana |
| With Canopic Jar: | High Arcana |
Percentages listed above are based on the chain level of the enemy killed. Check out the Grinding and Power Leveling page for more information.
Stolen
| Common - (55%) |  Lamia’s Tiara |
| Uncommon - (10%) | (Nothing) |
| Rare - (3%) | (Nothing) |
Poached
| Common - (95%) | Pebble |
| Uncommon - (5%) | Quality Stone |
Location
In order to make Barmuu appear you must defeat twelve of the same type of enemy in a row to establish a 12-chain. The easiest way to do this is to defeat the nearby Seekers without leaving the zone. Barmuu will spawn near the warp points in the center of the Royal Passage.