Slayer X (River Valley Ancient Ruins)
- Ruin guardian
- Cloud Mist Forest
Slayer X (River Valley Ancient Ruins) is a ruin guardian on Cloud Mist Forest: River Valley Ancient Ruins, level 25.
Boss facts
- Location
- River Valley Ancient Ruins
- Level
- 25
- Summon
- None: fought where it stands.
Steam achievement
- Hidden Pearl: River ValleyDefeat the Guardian of the River Valley ruins. Unlocked by 25.9% of Steam players.
Unlock rates read from the Steam achievement list on 12 November 2026; they count owners, not attempts.
Sources
- Soulmask Database boss page (game data, build 25955423)
- Steam global achievements (names, objectives and unlock rates, 12 November 2026)