OSRS Boss Gear & Inventories

Callisto / Artio

Combat level 470 · 1000 hitpoints

The bear of the Wilderness boss trio. Callisto is the multi-combat version (better drops, PK risk); Artio is the singles-plus version (safer, lower drop rates). Drops the Tyrannical ring and Voidwaker hilt.

Requirements

• Callisto: level 40 Wilderness (multi)
• Artio: singles-plus variant, weaker
• ~80+ combat

Pointers

• Protect from Melee. He is melee-only.
• His "roar" knocks you back and drains your prayer. Reactivate immediately.
• Callisto is in MULTI. A PK team can pile you instantly. Artio is singles-plus and much safer for solo learners.
• THE NUMBERS ON THIS PAGE ARE CALLISTO'S, the MULTI-COMBAT fight. Artio, the singles-plus variant, is now a separate encounter with its own stat block and its own page: 320 combat and 450 hitpoints against Callisto's.
• Bring a Dragon warhammer or Bandos godsword spec. His defence is meaningful.
• The Voidwaker hilt is the real prize; the Tyrannical ring is the consistent drop.

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: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:seedWeapon (sim): the weapon the ascent BEGAN from, taken off the dps-ranked weapon shortlist, or the forced weapon of a multi-start seed. Never off a start loadout.
• 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.
• 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.

Callisto / Artio strategies on the OSRS Wiki