Life Sap
Look for Life Sap on the skill icon to the right of the Ent promotion card. The trait shown underneath the card is a separate effect.
After promotion
At Lv.14, Ent can promote to Ent Lord, whose skill is Root Drain.
The quick answer
Ent’s Life Sap deals 115% attack damage and restores 8% of its own maximum HP. The cooldown is 5 seconds.
Steam Demo v0.4.1
Look for Life Sap on the skill icon to the right of the Ent promotion card. The trait shown underneath the card is a separate effect.
At Lv.14, Ent can promote to Ent Lord, whose skill is Root Drain.