Chinese-server data. English names and effects are provisional; untranslated details remain in Chinese.
Prayer stone
Cave Prayer Stone
洞穴祷石
BlueUniversalExtra effect · The slot’s highest Attunement reaches grade C
Source: Random drop
Prayer stone effects
In cave environments, increase allied units’ Defense by 20.
Extra effect
The slot’s highest Attunement reaches grade C
Increase Defense by another 10.
Acquisition source
Random drop
Recorded source: Random drop.
Source: 遗忘之海 · 祷石记录器 (Chinese)Lore
Item story
A hollow reaches almost all the way through the stone. Faint calls seem to come from within.