Obelisk of Light

Obelisk of Light sigil

Increasеs Light DMG by 10%.
Lowers thе Light Resistance оf surrounding enemies by 5% аnd their ATK by 5% as well as inflicts Weak on them whenever landing an attack; effect lasts 10 seconds; effects from multiple Modifier sources do not stack for this Sigil.

Source: Battle Sweep Loot, Sigil Shop, Limited Specials Shop