Sigil of Terratus is a Core Sigil in Tyranny.
Summon and control the light of Terratus Grave - the cold moon that shines on Kyros' empire. Gravelight leeches energy from its targets, dealing damage and converting it to health for the caster.
- Taught by Eb. Ask her about learning, command her to do so, then you can use Loyalty 4 or Fear 3 to learn it.
- Taught by Wagstaff in Bastard's Wound if you request knowledge as a reward for his quest (Tide Together).