Mighty slayer helmet

The mighty slayer helmet is a level 70 helm and the third and final tier of the upgraded full slayer helmet, obtained by upgrading a strong slayer helmet, using 600 Slayer reward points. After upgrading once, the price is decreased to 60 points for each upgrade. While retaining its boosts during slayer tasks, the mighty slayer helmet offers increased defence. Once purchased, the user has a 14% accuracy and damage boost in all combat styles while killing their assigned Slayer monster. Its defence bonus is identical to the Barrows helmets.

The helm can hold a maximum of 30 ferocious ring charges and 40 ring of slaying charges after purchasing the ability to attach them to the slayer helmets. For example, using a ferocious ring with 5 charges on a fused slayer helmet that has 27 charges ferocious ring charges already will result in 3 charges being added to the helmet and 2 charges remaining on the ring. Fused slayer helmets benefit from the ferocious ring damage boost. Fused slayer helmets can also be recharged with co-op points.

The helmet is upgraded for a price, but you must pay if you want to upgrade again; therefore, if you disassemble the helmet, you must spend more points in order to upgrade it again, so it is not suggested to disassemble it. The first time you obtain a full slayer helmet, it will cost 1,100 slayer reward points to upgrade from a full slayer helmet. Every subsequent upgrade will cost 10% of the original price, meaning that re-obtaining a mighty slayer helm a second time (and onwards) will cost only 110 slayer reward points to upgrade from the full slayer helm.

Comparison with other helmets
The mighty slayer helmet, even without the bonuses from fighting the assigned Slayer monster, is statistically one of the best helmets in the game to use. It holds the record of the highest "All" class helm in regards to defence, providing tier 70 protection from all styles. This makes it very useful when having to face all three styles at once, potentially rivaling the usefulness of higher-tiered helmets such as the superior death lotus hood or tectonic mask. The mighty slayer helmet does not degrade either.