Celestial surgebox

The celestial surgebox is a Dungeoneering reward item that is held in the off-hand slot. It requires 70 Magic, 70 Runecrafting and 70 Dungeoneering to equip, as well as 65,000 Dungeoneering reward tokens to purchase. The celestial surgebox can be charged with certain runes used in wave or surge spells, namely air runes and blood runes for wave spells, or air runes, blood runes and death runes for surge spells. Runes within the surgebox can be used alongside other runes or rune-supplying items such as elemental staves to cast wave or surge spells, depending on which setting the box is set to. To charge the box in wave mode, 5 air runes and 1 blood rune is needed for each charge; in surge mode, 7 air runes, 1 death rune and 1 blood rune is needed for each charge.

Every fifth spell cast from the celestial surgebox will score a "critical hit" and deal 25% extra damage in a separate hitsplat. The counter resets when a different monster is attacked, or if the caster takes an action such as eating food or drinking a dose of a potion. Damage from the extra hit is subject to the same modifiers as regular damage, such as the bonus from ferocious rings or casting fire spells on ice strykewyrms. Against players, the surgebox may still score critical hits, but the frequency is currently unknown and presumed to be random.

Celestial surgeboxes may also be received within Daemonheim as drops from forgotten mages (Tier 6+) that are visibly wielding them. These surgeboxes may be bound in the ammunition slot, although they are wielded as a piece of equipment. Any runes with which the surgebox is charged do carry over into other dungeons along with the box. However, only up to 125 casts worth of runes will be carried over in the surgebox. Runes used from the surgebox and not replaced before the end of the dungeon will be replenished at the start of the next floor. Additionally, it appears that celestial surgeboxes in Daemonheim do not have the critical hit ability.

Although the box may not look like it's up to the task, the Celestial Surge Box actually qualifies as a shield for the tank-class ring under the Ring of Kinship. As such, one may choose to bind this over arrows if he/she is a keyer and wishes to use the "tank" ring.

Dropping monsters

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Trivia:

 * If more than 125 charges are in a bound surgebox at the end of the dungeon, the amount of charges will be reduced to 125.
 * There was glitch where if a bound Celestial Surgebox in Daemonheim was charged with runes for surge spells and then switched to wave mode, after the floor resets, it would instead save the charges to wave mode, even if the box was switched back to surge mode. This has been partially fixed, as charging the box with runes for surge spells before binding it prevents this from happening.