Phantom Muspah Best in Slot Gear & Strategy Guide

The single hard requirement is completion of the quest Secrets of the North, which unlocks access to the Ghorrock Dungeon where the Muspah resides. There is no Slayer requirement to fight it — though it can be assigned as a Slayer task by Konar, Nieve, or Duradel, and only drops a Brimstone key when killed on a Konar task.

The boss lives near Weiss. The wiki lists several ways to get there: using the ring of shadows to teleport directly to the Ghorrock Dungeon, using an icy basalt, using the Weiss teleport from a player-owned house portal chamber or portal nexus, or sailing with Larry's boat north-east of Rellekka. Once in Weiss, enter the salt mine (from the staircase in Snowflake and My Arm's hut), go deeper to reach the Ghorrock Dungeon, then run south. The lair entrance is a crevice south-west of the dungeon.

If you die here, your grave appears outside the lair in the Ghorrock Dungeon, and the Muspah respawns 30 seconds after being defeated. A scoreboard by the crevice tracks your kill stats — and, as a bit of trivia, its plaque hides Morse code that reads "YOU GOT THIS BUDDY".

The wiki's suggested skills are 85+ Ranged, 85+ Magic (if using magic), 75+ Defence, and 74+ Prayer for Rigour (77+ for Augury). Higher Prayer is genuinely load-bearing here because the whole fight is overhead-prayer management — you will be flicking Protect from Missiles, Protect from Magic, Protect from Melee and Smite constantly, and a deeper prayer pool means fewer restore sips and fewer panic deaths. Construction 82+ (for an Ornate rejuvenation pool) or the elite Desert Diary (for the Desert Amulet 4 teleport) helps you bank-and-return quickly, and 81+ Herblore unlocks Surge potions, which pair well with Zaryte crossbow special-attack setups.

The meta style is to bring both Ranged and Magic and exploit each form's weakness — the ranged form has much lower ranged defence, and the melee form has much lower magic defence. Camping a single style works but greatly increases kill times, with range camping being slightly more optimal of the two. For the prayer-shield finale you also want a crossbow loaded with enchanted sapphire bolts, which drain the shield far faster.

Rather than list exact best-in-slot pieces, lean on the meta item families the wiki recommends: top-tier ranged armour and a high-end bow or crossbow for the ranged form, best-in-slot mage robes and a powerful staff or trident for the melee form, and a crossbow with sapphire bolts reserved for the shield. For an exact loadout tuned to your bank, use our Boss Gear Finder above, and compare ranged and magic options on our Ranged gear and Magic gear pages.

The Arceuus spellbook is strongly recommended for the toolkit it brings: thralls for extra damage, Greater Corruption to chew through the prayer shield, Ward of Arceuus to block the corruption prayer-drain, and Vile Vigour for run energy. Players who would rather avoid the step-back method can instead bring Ancient Magicks or the Standard spellbook to freeze the Muspah in its melee form — note it has 33% freeze resistance, so freezes last only 66% of their normal duration.

Build your inventory around staying alive through prayer drain and topping up special-attack-hungry weapons. The wiki's example trips carry a mix of: a strong food (anglerfish, manta ray, dark crab, or tuna potato), super restores to fix prayer (and stats), and a prayer potion or two. For damage and accuracy, divine ranging / divine bastion potions and a saturated heart (for magic) are used, with a surge potion recommended when running Zaryte crossbow special-attack setups.

• Ammunition: carry your main-damage arrows or bolts plus a stack of enchanted sapphire bolts (or sapphire dragon bolts) specifically for the prayer-shield phase.
• Run energy: a stamina potion helps with the constant kiting; Vile Vigour on Arceuus is an alternative.
• Utility: a divine rune pouch (with blood, fire, cosmic and soul runes for the recommended spells), the Book of the dead for thralls, and a ring of shadows — especially handy with the frozen tablet for instant returns after resupplying.
• Corruption: if you bring runes for Ward of Arceuus, you can nullify the magic attack's prayer drain — cheaper than a super-restore dose unless you eat 8+ corruption hits in a trip.

The Muspah can spawn in either ranged or melee form and swaps forms based on damage taken: roughly every 100 damage in ranged form (barring the teleport attack) and every 80 damage in melee form. Thrall damage does not count toward these thresholds (except during the final-stand transformation at ≤127 HP). Its base HP is 850. You can grind its defence down to 125, and that reduction carries between phases until the shield resets it.

Ranged form (weak to ranged). The ranged form spits green projectiles and is calculated on attack start, so keep Protect from Missiles on by default — this attack can hit up to 61. Occasionally it stands up and charges a purple orb for a magic attack: swap to Protect from Magic immediately when you see this, or take up to 72 damage. Even a fully-prayed magic hit applies corruption, which drains 3, 6, then 9 prayer points every 6 seconds — 18 prayer over 18 seconds total. Casting Ward of Arceuus makes you temporarily immune to corruption or cancels it after the fact.

Melee form (weak to magic). The Muspah also carries a 65% elemental weakness to wind (Air) spells, so leaning on Standard-spellbook wind spells (or a wind-spell setup) against the melee form maximises your magic damage. The melee form deals increasingly more damage the longer the Muspah stays still, even through prayer, with a max hit of 34. The fix is to never let it sit still: keep your distance, freeze it, or kite it. Skilled players use the step-back method — on the Muspah's 5-tick melee cycle, step one tile away on the third tick after it hitsplats you, so its chasing attack lands for 0 with Protect from Melee up. Lower-level players can simply kite it with ranged in an "octagon" run pattern (better than a square because of the boss's large 5x5 size).

Transformation spikes. When changing forms the Muspah slams the ground and spawns spikes around the arena, always including one under your current tile. Dodge it — standing on a spike knocks you to a clear tile and heals the boss for about 75% of the damage you dealt.

Special attacks (75% and 50% HP). Two teleporting specials trigger at 637 HP (75%) and 425 HP (50%). A ranged spawn uses Lightning Clouds first; a melee spawn uses Homing Spikes first; the unused one fires at 50%.

• Lightning Clouds: the Muspah rapidly teleports around the arena, leaving clouds that drift across it. A cloud hits up to 20, but you can avoid them by standing on a specific safe tile. The boss can still be attacked during this phase, and damage dealt here does not count toward a form swap.
• Homing Spikes: the boss slams the ground and 2–4 spikes slowly home in on you for about 20 seconds, moving one tile per two ticks and never diagonally. Stand behind grouped hardened spikes to block them; after ~20 seconds the homing spikes harden and stop.

Shockwave & shield (below 127 HP). When the Muspah drops below 127 HP, it teleports to the arena centre and unleashes a massive shockwave engulfing the whole arena. Stand behind a spike to avoid it — otherwise it hits up to 80 and applies an even harsher corruption drain than the magic attack. It then activates a prayer shield and the Soul Split overhead, and raises the max hit and accuracy of its attacks; in this form it hits up to 79 with magic. The shield has 75 health and drains by 2 after each of its attacks, and the boss heals 50% of any damage it takes while shielded. Drain it faster with Smite, a corruption spell, or enchanted sapphire bolts. Once the shield is gone the Muspah returns to ranged form (now at a faster 5-tick speed) and starts spawning spikes every four attacks, so finish it quickly before the arena fills.

The clean dual-style rotation is: use Ranged on the ranged form, switch to Magic on the melee form, and keep the correct overhead up at all times. In ranged form, default to Protect from Missiles and snap to Protect from Magic the instant you see the charge-up animation. In melee form, either freeze the boss and burst it with magic, or run the step-back method while praying melee.

If the Muspah spawns in melee form on a ranged-only setup, the wiki notes it can be worth leaving and re-entering the arena to start on the lower-ranged-defence ranged form instead. A few damage tricks help kill times: hitting the Muspah below 637 HP before it drops under 650 prevents it entering ranged form before the Lightning Cloud special, giving you a full 100 damage on the range form; and large hits during the Lightning Cloud phase can potentially skip the final melee phase entirely.

For the shield finale, switch to your crossbow with enchanted sapphire bolts and flick Smite. The wiki gives a 5-tick cycle for safe Smite flicks: tick 1 the ranged hit is calculated (Protect from Ranged must be up), ticks 2/3 are empty (use Smite), tick 4 the magic hit is calculated (Protect from Magic must be up), tick 5 is empty. With a 5-tick crossbow on rapid, attacking on the first possible tick of the shield phase keeps you on tick 2 of the cycle for consistent Smite. Sapphire bolts have a 25% chance (27.5% with the Hard Kandarin Diary) to drain around 33 prayer from the shield in one proc, so they tear it down fast.

Defence-lowering specials — Elder maul, Dragon warhammer, or Tonalztics of ralos — speed up kills considerably, and with a Zaryte crossbow a ruby-bolts special on the first melee phase is a strong opener.

The Muspah's prize unique is the Venator shard — when you receive one, you get no other loot that kill. The other unique is the Ancient icon, and the pet is Muphin at a rate of 1/2500. Beyond the uniques, the bulk of the value is ancient essence, dropped in large stacks every kill, plus a frozen cache, and broad secondary tables of runes, herbs, seeds, and resources.

Defeating the boss in under 3:00 also grants a charged ice (if you don't already have one), and Konar Slayer tasks add a Brimstone key. For the exact drop table and current rates, see the live drop panel on this page — and price any unique with our GE price tracker before you sell.

• Standing on transformation spikes. The spike under you on every form swap knocks you back and heals the boss ~75% of your damage. Always step off it.
• Reacting late to the magic charge-up. The purple-orb animation is your only warning. Flick to Protect from Magic immediately — even a late switch while the projectile is in transit cuts a lot of damage, but you'll still eat the corruption drain.
• Letting the melee form stay still. Its damage ramps the longer it stands, straight through prayer. Keep moving, freeze it, or run the step-back method.
• Eating the shockwave. Below 127 HP, get behind a spike before the centre teleport resolves or take up to 80 plus a heavy prayer drain.
• Brute-forcing the shield. Without Smite, sapphire bolts, or a corruption spell the 75-HP shield takes forever — and the boss heals while it's up. Bring the prayer-drain tools.
• Trying to freeze without accounting for resistance. Its 33% freeze resistance means freezes break early; re-freeze on time or it gets a melee hit in.