Abyssal Demon

Abyssal Demons can be found on the top floor of Morytania's Slayer Tower, and are, for many, the ultimate goal for slayers due to their coveted Abyssal Whip drop. However, because they require level 85 Slayer to kill, getting to them isn't easy.

Strategy
While Abyssal Demons aren't the most threatening creatures out there, they do pack some decent defences, so it is recommened that you take the best possible Melee gear available to you. One possiblity is to take advantage of the full Guthan's set's healing ability to conserve food. If you can afford it, the best option is to take Prayer potions and just use Protect From Melee while using your best possible offensive gear.

Weapon Slot: Abyssal Vine Whip -> Chaotic Longsword -> Chaotic Rapier -> Abyssal Whip -> Guthan's Spear

Offhand Slot: Dragon Defender -> Dragonfire Shield -> Rune Defender -> Adamant Defender

Head Slot: Torva Helmet -> Statius Full Helmet -> Helm of Neitiznot -> Berserker Helmet -> Barrows Helmet

Amulet Slot: Amulet of Fury -> Berserker Necklace -> Amulet of Glory -> Amulet of Strength

Cape Slot: Legend's Cape -> Tokhaar Kal -> Fire Cape

Torso Slot: Torva Platebody -> Vesta/Statius Platebody -> Bandos Chestplate -> Fighter Torso -> Barrows Platebody -> Rock Shell/Rune Platebody

Legs Slot: Torva Platelegs -> Vesta/Statius Platelegs -> Bandos Tassets -> Barrows Platelegs -> Dragon Platelegs -> Rock Shell/Rune Platelegs

Boots Slot: Primal Boots -> Promethium Boots -> Zephyrium Boots -> Argonite Boots -> Dragon Boots -> Fractite Boots -> Rune Boots

Gloves Slot: Barrows Gloves -> Dragon Gloves -> Rune Gloves

Ring Slot: Ring of Wealth(for best loot)/Berserker Ring (i)(for fastest kills) -> Berserker Ring -> Warrior Ring

100% Drop

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Weapons/Armours

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Runes

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Herbs

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Other Drops

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