Trident of the seas

The Trident of the seas is a magical staff that requires 75 Magic to wield. It is the only staff in game to have a built-in combat spell. The spell also attacks 25% faster than any other spell (2.4 seconds per attack instead of 3 seconds). Although the staff has a built-in magic attack, the spell cannot be used against other players in the Wilderness. The only way that the spell can be used against players is during Castle Wars and TzHaar Fight Pit minigames, as well as the Clan Wars minigame if the clan leaders enable it. The trident cannot be used to autocast any other combat spells.

Tridents are obtained as a rare slayer task drop from cave krakens or krakens with level 87 Slayer. An uncharged trident is dropped by the normal cave krakens, while the boss kraken can drop a fully charged trident. Similar to Barrows equipment, the trident is only tradeable when either uncharged or fully charged.

The staff can hold up 2,500 charges when fully charged. Charging the staff requires 1 death rune, 1 chaos rune, 5 fire runes and 10 coins per cast, costing coins to fully charge it. A fully charged Trident requires 2500 death runes, 2500 chaos runes, 12,500 fire runes and 25,000 coins. Both hands must be free in order to charge the weapon. Trident charges can be removed at anytime to recover the runes, however the coins will not be refunded. (requires 75 Magic to charge)

Unlike regular combat spells, the trident does not reward a base xp for each cast. Instead, players are rewarded experience for each point of damage dealt. The experience gained is 2 xp per damage dealt.

Players with level 59 Crafting can attach a magic fang to the trident using a chisel, creating a trident of the swamp. This enhances its magic attack bonus, and has the ability to infect a target with venom. However, to take advantage of those benefits requires using Zulrah's scales instead of coins to charge the trident.

Dropping monsters

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Maximum hit
The max hit dealt by the trident is dependent on the player's current Magic level, starting at 20 with level 75 magic and increasing by one every three magic levels, up to a maximum of 30 at level 105 (obtainable only through super magic potions in a Nightmare Zone dream). Both magic damage bonuses and stat boosts will modify the max hit of the spell; likewise, stat-reductions will lower the damage, but the minimum max hit will never fall below 20, even if the player's Magic level is reduced below 75. Corrections needed. 75 magic is able to hit over 20 with no boosts.

Trivia

 * The trident of the seas is the Oldschool RuneScape equivalent to the Polypore staff from RuneScape 3.
 * It shares the same spell casting animation from a Scarab mage attack.