Understand The Relentless Lost
Useful when…
- Consider it when you want the listed Strength and Efficiency gains from casting The Lost.
- Account for the reset: casting the same ability back-to-back resets the effect.
Effect and reset condition
At rank 0, the listed gain is 5% Ability Strength and 6% Ability Efficiency per cast; at rank 2 it is 25% and 12%; at rank 3 it is 35% and 15%. The effect stacks up to three times. Casting the same ability back-to-back resets the effect. No stack duration is specified.
Slot and fit
This Rare Xaku mod uses a standard slot, has Zenurik polarity and base drain 6, and can be ranked to 3. Its listed augment effect is tied to casting The Lost. The supplied details do not specify a broader set of qualifying casts or name any incompatible mods.
Rank investment
The listed next-rank fusion examples cost 30, 60, and 120 Endo, plus 1,449, 2,898, and 5,796 Credits. Rank 3 raises the per-cast bonus from rank 2’s 25% Strength and 12% Efficiency to 35% and 15%. Whether that increase is worth the final rank depends on how much the added listed bonus matters to your setup.
Other Xaku augment effects
Vampiric Grasp heals Xaku by 25 when a stolen weapon damages an enemy affected by The Lost: Gaze or The Vast Untime. Untime Rift connects to enemies suffering Void Status within 15 m, doubles debuffs applied by The Vast Untime, and maintains Void Status. Those stated effects serve different purposes from The Relentless Lost’s Strength and Efficiency gains.
Limitations and tradeoffs
- It occupies a standard Xaku mod slot and has base drain 6.
- Casting the same ability back-to-back resets the effect; no stack duration is specified.
Common mistakes to avoid
- Assuming the effect has a duration; none is specified.
- Assuming casts beyond the stated The Lost wording qualify, or overlooking that casting the same ability back-to-back resets the effect.






