Buy RS3 Abyssal bane off-hand longsword
The Abyssal bane off-hand longsword is a tier 79 melee weapon for the off-hand slot in RuneScape 3. It needs level 80 Attack to wield. It is made by upgrading a bane off-hand longsword + 4 with an abyssal whip at an anvil.
This sword shines against abyssal demons. When you pair it with its main-hand version, it boosts your ability damage by 25% while fighting any type of abyssal demon. On its own, it still raises your auto attack damage against them. This makes it a strong pick for Slayer tasks in the Abyss.
The weapon uses a Slash style with an attack range of 1. It has 483.9 ability damage and 1876 accuracy. It degrades over 50,000 charges of combat and can be repaired. The base cost for a full repair is 400,000 coins, and an armour stand or whetstone lowers that price.
Players with level 2 Invention can augment it. The augmented version holds one weapon gizmo with perks and can level up to 20 through use. Higher levels bring lower charge drain and better perk activity, so the sword grows stronger the more you fight with it.