★★★★★

Sword

Release version: 3.1
Maximum level: 90
Base ATK: 542
HP: 66.2%

Genshin Impact Weapon

Key of Khaj-Nisut

One of a paired set of scepters fashioned from obsidian. They say that this can be used as a key to open the gate to a paradise that lies at the end of the ocean of sand.

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At a glance

Key of Khaj-Nisut is a 5-star Sword released in Version 3.1. At Level 90, it has 542 Base ATK and 66.2% HP. Its Sunken Song of the Sands passive is documented from R1 to R5.

Rarity: 5 stars
Type: Sword
Maximum level: 90
Release version: 3.1

Lunaris data: version 7.1.0 (latest version reported by the source at import: 7.1.0), generated on September 22, 2026.This is the catalog generation date. Build guides separately state when their recommendations were checked.

Progression

Stats at level 90

Level

190

Base ATK: 542
HP: 66.2%

Passive effect

Sunken Song of the Sands

Refinement

HP increased by 20%. When an Elemental Skill hits opponents, you gain the Grand Hymn effect for 20s. This effect increases the equipping character's Elemental Mastery by 0.12% of their Max HP. This effect can trigger once every 0.3s. Max 3 stacks. When this effect gains 3 stacks, or when the third stack's duration is refreshed, the Elemental Mastery of all nearby party members will be increased by 0.2% of the equipping character's max HP for 20s.

Progression

Ascension materials

Total ascension cost. Level-up EXP and Mora, and extra copies for refinement, are not included.

Mora for ascensions: 225,000

Faded Red Satin
× 15
Trimmed Red Silk
× 23
Rich Red Brocade
× 27
Damaged Prism
× 23
Turbid Prism
× 27
Radiant Prism
× 41
Copper Talisman of the Forest Dew
× 5
Iron Talisman of the Forest Dew
× 14
Silver Talisman of the Forest Dew
× 14
Golden Talisman of the Forest Dew
× 6

Names source: Lunaris

Choosing your equipment

Which characters can use it?

These documented uses explain the conditions behind each choice. They are neither an exhaustive list nor a current-patch damage ranking.

Nilou

Build guide : Nilou

Why choose it: HP strengthens Nilou’s Bountiful Core damage bonus, so the benefit extends beyond her personal damage. Key also grants Elemental Mastery to Nilou, then to the whole team once its passive is fully activated.
Conditions: For Bountiful Cores, use only Hydro and Dendro characters with both elements present and complete all three dance steps to activate her team passive. For the weapon passive, land three Elemental Skill hits while Nilou is on field: each trigger, at least 0.3s apart, grants a stack. At three stacks, the teamwide EM buff based on her Max HP lasts 20s; refreshing the third stack renews it.
Tradeoffs: Craftable Iron Sting gives Nilou EM, but neither Key’s HP nor its shared EM buff. Its value depends on who triggers Bloom; a personal-damage sword does not automatically replace this team utility. Check that all three stacks are active before swapping to teammates.

KQM guide 7.1. Qualitative uses and catalog passive, not a current-patch ranking.

Source: KQM guide

Consulted on Oct 22, 2026

Compare with your own equipment

Compare with Iron Sting Details

Progression

Stats by level

Stored values at the main progression milestones from level 1 to 90.

Level	Base ATK	HP
1	44	14.4%
20	110	25.4%
40	210	37.1%
50	275	42.9%
60	341	48.7%
70	408	54.5%
80	475	60.3%
90	542	66.2%

Sunken Song of the Sands

R1–R5 refinement effects

Every refinement is visible together for direct comparison.

R1

R2

HP increased by 25%. When an Elemental Skill hits opponents, you gain the Grand Hymn effect for 20s. This effect increases the equipping character's Elemental Mastery by 0.15% of their Max HP. This effect can trigger once every 0.3s. Max 3 stacks. When this effect gains 3 stacks, or when the third stack's duration is refreshed, the Elemental Mastery of all nearby party members will be increased by 0.25% of the equipping character's max HP for 20s.

R3

HP increased by 30%. When an Elemental Skill hits opponents, you gain the Grand Hymn effect for 20s. This effect increases the equipping character's Elemental Mastery by 0.18% of their Max HP. This effect can trigger once every 0.3s. Max 3 stacks. When this effect gains 3 stacks, or when the third stack's duration is refreshed, the Elemental Mastery of all nearby party members will be increased by 0.3% of the equipping character's max HP for 20s.

R4

HP increased by 35%. When an Elemental Skill hits opponents, you gain the Grand Hymn effect for 20s. This effect increases the equipping character's Elemental Mastery by 0.21% of their Max HP. This effect can trigger once every 0.3s. Max 3 stacks. When this effect gains 3 stacks, or when the third stack's duration is refreshed, the Elemental Mastery of all nearby party members will be increased by 0.35% of the equipping character's max HP for 20s.

R5

HP increased by 40%. When an Elemental Skill hits opponents, you gain the Grand Hymn effect for 20s. This effect increases the equipping character's Elemental Mastery by 0.24% of their Max HP. This effect can trigger once every 0.3s. Max 3 stacks. When this effect gains 3 stacks, or when the third stack's duration is refreshed, the Elemental Mastery of all nearby party members will be increased by 0.4% of the equipping character's max HP for 20s.

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