The Key of Khaj-Nisut is a five-star sword designed to buff the wielder's HP and Elemental Mastery, and apply a party-wide Elemental Mastery buff that scales against the wielder's HP. It's the perfect companion for HP-scaling characters like Nilou and Kuki Shinobu.
How to get the Key of Khaj-Nisut in Genshin Impact
The Key of Khaj-Nisut is a limited weapon that can only be obtained whenever it's featured on rate-up in the Epitome Invocation banner, which you can pull on using Primogems and Intertwined Fates. As such, you need to wait for it to go on rotation and chart an Epitomized Path to guarantee the Key of Khaj-Nisut at the third pity.
Genshin Impact Key of Khaj-Nisut stats
- Base Attack: 44-542
- Substat: HP (14.4 to 66.2 percent)
- Passive: Sunken Song of the Sands—HP increased by 20/25/30/35/40 percent. When an Elemental Skill hits opponents, you gain the Grand Hymn effect for 20 seconds. This effect increases the equipping character's Elemental Mastery by 0.12/0.15/0.18/0.21/0.24 percent of their Max HP. This effect can trigger once every 0.3 seconds. Max 3 stacks. When this effect gains three stacks, or when the third stack's duration is refreshed, the Elemental Mastery of all nearby party members will be increased by 0.2/0.25/0.3/0.35/0.4 percent of the equipping character's max HP for 20 seconds.
Related: Aqua Simulacra: How to get, Ascension, stats, and who can use it in Genshin Impact
Genshin Impact Key of Khaj-Nisut Ascension cost & materials
Below are all the Ascension materials necessary for the Key of Khaj-Nisut. They can be farmed from the following:
- Satin/Silk/Brocade - Eremites
- Prism - Primal Constructs
- Talisman of the Forest Dew - Tower of Abject Pride (Monday, Thursday, Sunday)
Ascension Phase 1
 x10,000 Mora |  x3 Faded Red Satin |  x5 Damaged Prism |  x5 Copper Talisman of the Forest Dew |
Ascension Phase 2
x20,000 Mora | x12 Faded Red Satin | x18 Damaged Prism |  x5 Copper Talisman of the Forest Dew |
Ascension Phase 3
x30,000 Mora |  x9 Trimmed Red Silk |  x9 Turbid Prism | x9 Iron Talisman of the Forest Dew |
Ascension Phase 4
x45,000 Mora | x14 Trimmed Red Silk | x18 Turbid Prism |  x5 Silver Talisman of the Forest Dew |
Ascension Phase 5
x55,000 Mora |  x9 Rich Red Brocade |  x14 Radiant Prism | x9 Silver Talisman of the Forest Dew |
Ascension Phase 6
x65,000 Mora | x18 Rich Red Brocade | x27 Radiant Prism |  x6 Golden Talisman of the Forest Dew |
Who can use the Key of Khaj-Nisut in Genshin Impact
The Key of Khaj-Nisut focuses on buffing HP and Elemental Mastery based on the wielder's HP, so it's the perfect weapon for support characters whose kits also revolve around these two stats. As a result, it's a niche weapon that can only be efficiently used by two characters:
However, since the Key of Khaj-Nisut also buffs the wielder and team's Elemental Mastery, it's a good idea to build the wielder as in a way that allows them to constantly trigger Elemental Reactions. That could mean picking a Bloom build for Nilou as opposed to solely focusing on her personal DPS. Additionally, you may want to add characters who benefit from Elemental Mastery into the team to efficiently proc the weapon's passive bonus.
For more weapon guides, check out Amos’ Bow: How to get, Ascension, stats, and who can use it in Genshin Impact.
Nicki is a freelance writer with 5 years of writing experience. She's a fan of anything from HoYoverse, from Genshin Impact to Tears of Themis and Honkai: Star Rail. She also loves rhythm games like BanG Dream! and D4DJ.