Appearance
Nezumi-ō, the Rat King
Boss
| Stat | Value |
|---|---|
| Health | 2,112–41,760 |
| Power | 26–539 |
| Defense | 11–194 |
| Speed | 9.5 m/s |
| Aggro radius | 15 m |
| Material |  Rat King's Crown |
Health, power and defense: from the lowest to the highest level it is met at. Inside a gate the monsters take the level of the first one in, and their stats and experience follow that level; health and power grow by half for every further party member.
Where
Attacks
| Attack | Shape | Range | Wind-up | Cooldown | Damage | Effects | Warning |
|---|---|---|---|---|---|---|---|
| King's Bite | Melee strike | 3.4 m | 0.31 s | — | 140% of power | Poison 4 s | No |
| Plague Breath | Cone, 80° | 9 m | 0.62 s | 7 s | 190% of power | Poison 5 s | Yes |
| Flood of Rats | Areas under up to 3 players, 3 m each | 20 m | 0.74 s | 9 s | 180% of power | Slowed 2 s | Yes |
| King's Stomp | Area around itself, 6.5 m | 6 m | 0.79 s | 12 s | 200% of power | Stunned 1.4 s | Yes |
Below 75% health
Speed ×1.05, power ×1.1. Summons 2× 
Rat Swarm.
| Attack | Shape | Range | Wind-up | Cooldown | Damage | Effects | Warning |
|---|---|---|---|---|---|---|---|
| King's Bite | Melee strike | 3.4 m | 0.31 s | — | 140% of power | Poison 4 s | No |
| Plague Breath | Cone, 80° | 9 m | 0.62 s | 7 s | 190% of power | Poison 5 s | Yes |
| Flood of Rats | Areas under up to 3 players, 3 m each | 20 m | 0.74 s | 9 s | 180% of power | Slowed 2 s | Yes |
| King's Stomp | Area around itself, 6.5 m | 6 m | 0.79 s | 12 s | 200% of power | Stunned 1.4 s | Yes |
| Storm of Rats | Area around itself, 9 m | 9 m | 0.96 s | 15 s | 230% of power | Poison 5 s | Yes |
Below 50% health
Speed ×1.15, power ×1.25. Summons 2× Rat Swarm.
| Attack | Shape | Range | Wind-up | Cooldown | Damage | Effects | Warning |
|---|---|---|---|---|---|---|---|
| King's Bite | Melee strike | 3.4 m | 0.31 s | — | 140% of power | Poison 4 s | No |
| Plague Breath | Cone, 80° | 9 m | 0.62 s | 7 s | 190% of power | Poison 5 s | Yes |
| Flood of Rats | Areas under up to 3 players, 3 m each | 20 m | 0.74 s | 9 s | 180% of power | Slowed 2 s | Yes |
| King's Stomp | Area around itself, 6.5 m | 6 m | 0.79 s | 12 s | 200% of power | Stunned 1.4 s | Yes |
| Storm of Rats | Area around itself, 9 m | 9 m | 0.96 s | 15 s | 230% of power | Poison 5 s | Yes |
Below 25% health
Speed ×1.3, power ×1.4. Summons 3× Rat Swarm.
| Attack | Shape | Range | Wind-up | Cooldown | Damage | Effects | Warning |
|---|---|---|---|---|---|---|---|
| King's Bite | Melee strike | 3.4 m | 0.31 s | — | 140% of power | Poison 4 s | No |
| Plague Breath | Cone, 80° | 9 m | 0.62 s | 7 s | 190% of power | Poison 5 s | Yes |
| Flood of Rats | Areas under up to 3 players, 3 m each | 20 m | 0.74 s | 9 s | 180% of power | Slowed 2 s | Yes |
| King's Stomp | Area around itself, 6.5 m | 6 m | 0.79 s | 12 s | 200% of power | Stunned 1.4 s | Yes |
| Storm of Rats | Area around itself, 9 m | 9 m | 0.96 s | 15 s | 230% of power | Poison 5 s | Yes |
Drops
| Drop | Count | Chance per kill |
|---|---|---|
 Uncommon Mana Crystal /  Rare Mana Crystal /  Epic Mana Crystal /  Legendary Mana Crystal | 1 | 98%–100% |
| Rat King's Crown | ×1–3 | 30% |
 Rat King's Pistols /  Rat King's Crown of Tails /  Rat King's Fur Mantle | 1 | 4.95%–5% |
 Return Crystal | 1 | 5% |
 Mythic Mana Crystal (Mythic) | 1 | 0%–2% |
 Little Rat King (cosmetic) | 1 | 1% |
| Rat King's Pistols / Rat King's Crown of Tails / Rat King's Fur Mantle (Mythic) | 1 | 0%–0.05% |