OSRS Scurrius Guide (2025)
Scurrius, the Rat King, is a boss living in the Varrock Sewers in Old School RuneScape. Found beneath Varrock, he offers mid-level players a rewarding boss fight that combines active combat, prayer switching, and movement. Unlike static training methods such as Sand Crabs or Nightmare Zone, Scurrius provides combat experience in a way that teaches valuable mechanics used in higher-level PvM encounters. The fight is approachable for players around level 60–90 combat, but it still requires awareness and preparation. On top of the combat training, his unique drop, the Scurrius Spine, allows you to craft Rat Bone Weapons, which provide strong bonuses against him and his minions.
OSRS Scurrious Location and Requirements
Scurrius can be found inside the Varrock Sewers. To reach him, players need to use the manhole just east of Varrock Palace, navigate to the broken bars, and pass through to his arena. When entering, players can choose between a public or private instance.
The private instance contains a weaker version of Scurrius with about 500 hitpoints and a combat level of 200. This version is ideal for solo play or small groups, and the drops remain worthwhile. The public instance is much stronger, with Scurrius at 1500 hitpoints and a combat level of 250. Fighting him here grants a 20% experience boost, which makes it especially valuable for training in larger groups.
There are no formal requirements to fight Scurrius, though players with at least 60 in their combat stats and 43 Prayer for protection prayers will find the encounter much smoother.
OSRS Scurrius Boss Mechanics and Attacks
Scurrius is designed to expose players to a range of combat mechanics without overwhelming them. He attacks using melee, magic, and ranged styles, and also has special abilities that force you to move and manage additional enemies.
His melee attack is a quick tail swipe that can hit hard, especially in the early phase of the fight. Moreover, his magic attack sends out blue lightning that deals damage if not protected against, while his ranged attack involves him throwing clumps of fur that can strike accurately. Both are covered by the relevant protection prayers.
Throughout the fight, Scurrius also causes rubble to fall from the ceiling. A shadow appears on the ground before it lands, giving you just enough time to step away. If ignored, the rubble can inflict between 15 and 24 damage, which is often a fight-ending mistake for mid-level players.
At certain points, Scurrius summons level 6 giant rats to assist him. These rats can be a real threat if ignored, since they deal consistent damage and strike through prayers. Managing them quickly is key to survival and efficiency. This is where Rat Bone Weapons shine, as they instantly kill the rats without any attack delay.
Finally, Scurrius periodically runs to food piles inside his lair. While feeding, he heals five hitpoints per tick, which can drag out the fight considerably if not managed. During this healing phase, he continues using magic, ranged, and rubble attacks but stops using melee.
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Scurrius Fight Phases and Strategy in OSRS
The fight against Scurrius follows three main phases. The first phase begins when you engage him. Scurrius primarily relies on melee in this stage, so Protect from Melee should be kept active while you focus on consistent damage. During this phase, rubble occasionally falls from the ceiling, and learning to move out of it early will save you many supplies in the long run.
When Scurrius reaches around 80% health, the second phase begins. He runs to a food pile and starts healing. At this point, he switches to using ranged and magic attacks, combined with falling rubble. This phase also introduces giant rats, which can quickly overwhelm an unprepared player. Rat Bone Weapons instantly deal with the minions, making this phase significantly easier. If you do not yet have one, using area-of-effect weapons such as chinchompas or explosive special attacks can help clear the rats. Prayer switching becomes more important here, since you will want to protect from the style that threatens you most, depending on the gear setup.
The final phase begins once Scurrius drops below 30% health. He moves to the center of the arena and becomes more aggressive, attacking with rapid ranged and magic while continuing to summon rats and drop rubble. This phase is the most dangerous because of the pressure from multiple mechanics happening at once. Efficient prayer flicking, quick movements to avoid rubble, and eliminating rats as soon as possible are essential to secure the kill. If Scurrius manages to heal back above 30%, he can return to the previous phase and repeat his healing behavior.
Recommended Gear and Inventory for Scurrious Fight
The fight can be tackled with melee, ranged, or magic, depending on your preference and gear availability. Melee setups often revolve around the Dragon scimitar or similar weapons, paired with defensive gear such as the Dragon defender and tanky armor. Ranged setups can make use of the magic shortbow (imbued) or crossbows with strong bolts. Magic users benefit from staves like the Trident of the Seas or Iban’s Staff, paired with Ahrim’s or Mystic robes.
Regardless of style, players should bring food such as sharks or better, along with prayer potions to sustain protection prayers. Teleports are optional in private instances but recommended in public ones for emergencies. Players without Rat Bone Weapons may find it useful to carry area-of-effect gear or special attack weapons to deal with rats more efficiently.
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OSRS Scurrius Fight Loot and Rewards
Scurrius drops a variety of items, though the most notable is the untradeable Scurrius Spine. This item is essential for crafting Rat Bone Weapons and is the main long-term reward from the boss.
Other loot includes bones, coins, various runes, and lower-value equipment. Players who score the most damage in the fight, also known as the MVP, receive better rewards, including tertiary drops. These can include clue scrolls, long and curved bones, and the rare pet Scurry, which has a one in three thousand chance of being obtained.
After defeating Scurrius, players can use the food piles in the arena to restore their health completely once every ten minutes, which helps reduce supply costs over multiple kills.
Final Words
Scurrius is one of the most valuable additions for mid-level players in Old School RuneScape. He teaches the fundamentals of prayer usage, add management, and movement, while also rewarding players with excellent experience rates and the chance to craft unique weapons.
While his mechanics may seem simple compared to high-end bosses, they provide the perfect stepping stone into more challenging fights. With preparation, proper gear, and smart use of Rat Bone Weapons, players can defeat the Rat King consistently and turn his lair into a reliable source of training and rewards.
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