Shellbane Gryphon
Combat level 235 · 400 hitpoints
A solo instanced Slayer boss in a cave at the centre of The Great Conch, north of fairy ring CJQ. Released 19 November 2025. It can only be fought on a gryphon task, or off-task with the relevant elite clue step in your inventory.
Requirements
- 51 Slayer
- Troubled Tortugans quest
- Gryphon Slayer task (or elite clue step)
- TORTUGAN SHIELD REQUIRED (cape slot)
Pointers
- A TORTUGAN SHIELD is mandatory. Without it you take heavy unmitigated damage and the fight is unwinnable. Despite the name it is a CAPE slot item, so your shield hand stays free and two-handed weapons are fine.
- Wearing it costs you your cape, which on a ranged trip means no Ava's device and therefore no ammunition recovery. Budget for the ammo you will lose, or bring a charge-powered weapon.
- Knockback special: up to 30 unavoidable damage. Countered by wearing gear weighing 40kg or more. Build weight deliberately.
- Corrosive spit corrodes your worn equipment unless you move away; you can interrupt it by unequipping the targeted item.
- Whirlwinds form on your current tile. Move one square per attack so they never stack on you.
- It attacks mostly with melee and occasionally ranged, and it is weak to melee.
What the sim brings here
Every worn slot and every inventory row below is the combat simulation's own output, at the style it ranks fastest for each account tier. Each line carries the channel that chose it: sim means the model solved it, and inherited means the value came through from the hand-authored loadout the solver starts from. Riding through a generator does not make a value derived, so those are marked rather than presented as the model's answer. A line marked unattributed carries a channel the model's own vocabulary no longer declares, so no word is put on it at all rather than one being read off the channel's spelling. Where the model has not answered a row, its own refusal is printed instead; where it has answered a row it doubts, the answer is printed with the doubt attached rather than withheld.
max tier, melee (Melee is fastest)
Worn gear: 11 of 11 slots chosen by the sim.
- Head: Oathplate helm sim
- Cape: Infernal cape sim
- Neck: Amulet of rancour sim
- Ammo: Ancient blessing sim
- Weapon: Holy scythe of vitur sim
- Body: Granite body sim
- Shield: nothing sim
- Legs: Oathplate legs sim
- Hands: Ferocious gloves sim
- Feet: Avernic treads (max) sim
- Ring: Ultor ring sim
The model doubts this gear (tied with an identical item, so enumeration order decided): the head, ammo, weapon, legs slots each hold an item the model cannot tell apart from an alternative the search could equally have taken, re-scored identical in this row's own bag. Enumeration order decided it, so the sim had NO REASON; that is not the same as the pick being wrong. SOLVED_GEAR_TIES names them.
Inventory: 6 of 7 rows chosen by the sim, 1 carrying no channel at all.
- Cosmic rune sim
- Super combat potion(4) x2 sim
- Saradomin brew(4) x4 sim
- Super restore(4) x14 sim
- Zamorak brew(4) x2 sim
- Rune pouch sim
- Max cape ruled
Spellbook: Standard, claimed by High Level Alchemy (a purpose the boss page names). Grants High Level Alchemy. Cannot cast Vengeance. Vengeance is on Lunar and High Level Alchemy (utility) has claimed Standard. One book per trip.
Open question, not a ruling: Shane: whether runes the page tells the player to carry (alching, telegrab, a mechanic closer) outrank a thrall or Vengeance the damage model ranked on value, when the two live on different books. Default (a) utility wins, chosen by the session-53 coordinator, 2026-09-14, pending Shane
Trip: about 70.03 kills in 38 minutes, limited by prayer.
mid tier, melee (Melee is fastest)
Worn gear: 11 of 11 slots chosen by the sim.
- Head: Oathplate helm sim
- Cape: Infernal cape sim
- Neck: Amulet of torture sim
- Ammo: Ancient blessing sim
- Weapon: Soulreaper axe sim
- Body: Granite body sim
- Shield: nothing sim
- Legs: Oathplate legs sim
- Hands: Ferocious gloves sim
- Feet: Guardian boots sim
- Ring: Ultor ring sim
The model doubts this gear (tied with an identical item, so enumeration order decided): the head, neck, ammo, legs slots each hold an item the model cannot tell apart from an alternative the search could equally have taken, re-scored identical in this row's own bag. Enumeration order decided it, so the sim had NO REASON; that is not the same as the pick being wrong. SOLVED_GEAR_TIES names them.
Inventory: 9 of 10 rows chosen by the sim, 1 carrying no channel at all.
- Cosmic rune sim
- Dragon claws sim
- Halibut x3 sim
- Super combat potion(4) sim
- Saradomin brew(4) x2 sim
- Super restore(4) x11 sim
- Zamorak brew(4) sim
- Cooked moonlight antelope x3 sim
- Rune pouch sim
- Teleport to house (tablet) ruled
Spellbook: Standard, claimed by High Level Alchemy (a purpose the boss page names). Grants High Level Alchemy. Cannot cast Vengeance. Vengeance is on Lunar and High Level Alchemy (utility) has claimed Standard. One book per trip.
Open question, not a ruling: Shane: whether runes the page tells the player to carry (alching, telegrab, a mechanic closer) outrank a thrall or Vengeance the damage model ranked on value, when the two live on different books. Default (a) utility wins, chosen by the session-53 coordinator, 2026-09-14, pending Shane
Trip: about 37.9 kills in 28 minutes, limited by prayer.
budget tier, melee (Melee is fastest)
Worn gear: 11 of 11 slots chosen by the sim.
- Head: Oathplate helm sim
- Cape: Deep sea apparatus sim
- Neck: Amulet of strength sim
- Ammo: Rada's blessing 2 sim
- Weapon: Soulreaper axe sim
- Body: Oathplate chest sim
- Shield: nothing sim
- Legs: Justiciar legguards sim
- Hands: Barrows gloves sim
- Feet: Guardian boots sim
- Ring: Ultor ring sim
The model doubts this gear (tied with an identical item, so enumeration order decided): the head, neck, ammo, body slots each hold an item the model cannot tell apart from an alternative the search could equally have taken, re-scored identical in this row's own bag. Enumeration order decided it, so the sim had NO REASON; that is not the same as the pick being wrong. SOLVED_GEAR_TIES names them.
Inventory: 6 of 7 rows chosen by the sim, 1 carrying no channel at all.
- Cosmic rune sim
- Super combat potion(4) sim
- Saradomin brew(4) x5 sim
- Super restore(4) x12 sim
- Zamorak brew(4) x4 sim
- Rune pouch sim
- Ring of dueling(8) ruled
Spellbook: Standard, claimed by High Level Alchemy (a purpose the boss page names). Grants High Level Alchemy. Cannot cast Vengeance. Vengeance is on Lunar and High Level Alchemy (utility) has claimed Standard. One book per trip.
Open question, not a ruling: Shane: whether runes the page tells the player to carry (alching, telegrab, a mechanic closer) outrank a thrall or Vengeance the damage model ranked on value, when the two live on different books. Default (a) utility wins, chosen by the session-53 coordinator, 2026-09-14, pending Shane
Trip: about 40.71 kills in 32 minutes, limited by prayer.
What each of those badges means
- derived:ascent (sim): an accepted coordinate-ascent move: betterThan() preferred this candidate over the incumbent under the row objective and band. The weapon+ammo+shield pairing and the crystal set arrive here too, because both are offered to the same acceptance test.
- derived:cheapestEqual (sim): cheapestOfEquals(): at budget, an exactly-tied cheaper item replaced the one in this slot. It changes the price and, by construction, not the score.
- derived:composed (sim): balanceInventory() sized this row from the derived supply menu. The menu enumerates CONSUMABLES and narrows by style, tier and price; it is not the authored bag.
- derived:empty (sim): the finished loadout leaves this slot EMPTY, and that is an ANSWER rather than a gap: a two-handed weapon forfeits the shield and a weapon that stores its own ammunition frees the ammo slot. Recorded so a null slot is never read as unprovenanced.
- derived:pouch (sim): derivePouchInto(): the rune pouch and its loose overflow, from the spell the build actually casts and the pouch slot criterion. Not from a pouch a human typed.
- derived:spec (sim): a carried special-attack weapon PROPOSED by `specPlan` (specchoice.js), which prices every SPEC_ATTACKS weapon that deals damage or drains defence on top of the bag solved without one, and KEPT by `judgeSpecArms` only where the composed bag with it beats the bag without it under `compareScores`. The row's `kpt.specWeapon` carries both arms.
- derived:weightSeed (sim): heaviestStart(): this encounter STATES an equipment-weight requirement the light ascent could not reach, so the ascent was restarted from the heaviest admissible loadout in the pool. Pool-derived, never a list.
- ruled:escape (ruled): escapeLeg(): the way OUT, taken from the typed per-tier table ESCAPE_PLAN and judged against the account, with nothing substituted and no fallback ladder. The ACCOUNT CHECK is a derivation; the CHOICE of item is not, so this is not a `derived:` channel. ESCAPE_PLAN carries no attributedTo field (PROVENANCE_BACKLOG: silent-and-unattributed), so this channel does not claim one either.