This spell is a part of the Grounding spell chain and can be found in the Grounding rune stone.

With a swift movement the earth opens up what appears to be a mouth with a long snout and closes on the target. The earth stands, holding the target. When the earth closes around the target that is counted as 3. Target’s turn goes by and the countdown goes down to 2. The target’s turn goes by again and the countdown goes down to 1. After the target’s next turn, the earth sinks to become once more level with the rest of the ground and the target is dead. The target can be freed by attacking the earth around the Entomb spell but only with magic. The Entomb Spell has 150 Vitality, and once that Vitality is gone, the target will be freed. 

Stat Cost: 40 Soul
Casting Speed: 4
Duration: entombed for 3 rounds or until freed
Range & Area: 1 target
Success Rate:  40
Max Success Rate:  70

Level 2 Upgrade: Increase spell's Vitality by 25.

Stat Cost: 50 Soul
Casting Speed: 5
Duration: entombed for 3 rounds or until freed
Range & Area: 1 target
Success Rate:  30
Max Success Rate:  60

This is a Tier 5 spell

Level 1: 150/300
Level 2: 175/350
Level 3: 200/400
Level 4: 225/450