World bosses
“A demonic digger.”
The Doom of Mokhaiotl, also referred to as Osto-Ayak, is a giant insect-like, demonic boss found in the Ruins of Mokhaiotl, which is accessed during The Final Dawn quest, deep beneath the Tlati Rainforest.
Attack styles
Max hit
| Item | Quantity | Rarity | Value |
|---|---|---|---|
| 50 | always | 500 gp | |
| 1 (noted) | 1/21 | 100,000 gp | |
| 1 (noted) | 1/21 | 42,500 gp | |
| 1-3 (noted) | 1/21 | 32,000 gp | |
| 50-70 | 1/21 | 180 gp | |
| 50-70 | 1/21 | 90 gp | |
| 500-1000 | 1/21 | 4 gp | |
| 500-1000 | 1/21 | 4 gp | |
| 200-600 | 1/21 | 5 gp | |
| 5-15 | 1/21 | 13,633 gp | |
| 15-50 (noted) | 1/21 | 45 gp | |
| 20-60 (noted) | 1/21 | 150 gp | |
| 3-6 (noted) | 1/21 | 3,200 gp | |
| 151-400 | 1/21 | 200 gp | |
| 30-90 | 1/21 | 250 gp | |
| 18-75 | 1/21 | 160 gp | |
| 100-300 | 1/15 | 500 gp | |
| 1-2 | 1/15 | 10,000 gp | |
| 1 | 1/35 | 540 gp | |
| 1-3 | 1/52 | 50 gp | |
| 1 | 1/35 | 1 gp | |
| 20-35 (noted) | 1/31 | 170 gp | |
| 40-70 | 1/62 | 10 gp | |
| 1 | 1/75 | 20 gp | |
| 2-4 (noted) | 1/104 | 270,000 gp | |
![]() | 1 | 1/104 | - |
| 1 | 1/1,350 | 192,000 gp | |
| 1 | 1/2,000 | 6,000,000 gp | |
| 1 | 1/2,500 | 200,000 gp | |
| 1 | 1/1,000 | 1 gp |
Boss information and pictures from the Old School RuneScape Wiki (CC BY-NC-SA 3.0).