OSRS Boss Gear & Inventories

Dagannoth Rex

Combat level 303 · 255 hitpoints

The melee king and the standard solo money method. His magic defence is 10 against 255 everywhere else and his Magic level is 0, so magic is very nearly the only thing that lands. He drops the Berserker and Warrior rings. See the Dagannoth Kings page for the tribrid trip that kills all three.

Requirements

• Horror from the Deep
• Waterbirth Island access
• 70+ Magic

Pointers

• The safespot is the method. From the eastern wall Rex can be attacked with a long range magic spell or staff without alerting the other kings, and there are further safespots on the north-eastern, south-eastern and north-western walls.
• It is a magic answer specifically: you move until Rex is stuck on a wall and unable to reach you, which is exactly what a melee trip cancels by standing next to him.
• Rex carries a 35% elemental weakness to Earth, so an earth spell is worth more here than a generic powered staff at the lower tiers.
• What actually drains your supplies is not Rex. The Spinolyps in the moat attack with ranged-based magic and the strategy page calls them the main drain, so bring range defence.
• Because Rex deals melee only, one overhead covers him entirely, and the trip tends to end on prayer rather than on food.
• The kill is a small part of the cycle: a king respawns 150 ticks (90 seconds) after it dies, and a single-king trip spends most of that waiting.

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.

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: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:travel (sim): travelPlan(): the way IN, ranked out of the derived transport graph against this account's own unlocks, rather than copied from whatever a human typed. The way OUT is a separate channel (`ruled:escape`) because it is a typed choice, not a ranking.
• derived:voidSeed (sim): the Void set offered assembled, because an all-or-nothing set effect pays nothing until four slots are right and every single step toward it is a strict loss. The pieces come from VOID_SET in combat.js, the same names its own predicate tests.
• 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.

Other pages for this encounter

• Dagannoth Kings (the whole encounter)
• Dagannoth Prime (just this one)
• Dagannoth Supreme (just this one)

Dagannoth Rex strategies on the OSRS Wiki