Tanzanite mutagen
Tanzanite mutagen
Release date 30 April 2015 (Update)
Members only? Yes
Quest item? No
Tradeable? No
Equipable? No
Stackable? No
High Alch 5,700 coins
Low Alch 3,800 coins
Destroy Drop
Store price Not sold
Weight 0 kg
Triggers mutation in a serpentine helm.

A tanzanite mutagen is an untradeable item dropped by Zulrah. It allows a player to cosmetically recolour their serpentine helm to a turquoise coloured tanzanite helm.

Dropping monstersEdit

Monster Combat level Quantity Rarity
Zulrah 725 1 5; Very rare (1/6,553.6)

Drop rateEdit

The drop rate for this item is calculated from two different rolls: The chance of rolling Zulrah's flax table (1/25.6) and the chance of rolling the mutagen table (1/256)[1].

Thus, multiplying these two fractions will result in 1/6,553.6, which is Zulrah's chance of dropping a mutagen, or a 1/13,107.2 chance of a specific mutagen.

However, since Zulrah gives two rolls to its drop table per kill, the chances are doubled, giving a 1/3,276.8 chance for any mutagen or a 1/6,553.6 chance for a specific mutagen.


  1. Jagex. Mod Ash's Twitter account. 10 May 2015. Mod Ash: "Yes. The flax bit is 10/256, so each mutagen is therefore 1 in 13.1k. or 1 in 6.5k of getting either colour."

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