Vinesnare
After this unit'sUnitUnits fall under 2 categories: party and enemy. These 2 categories, in relation to one another, are referred to as opposing units. engageEnemy TurnAfter all adventurer turns (and any companion turns), each enemy takes a turn in order from highest to lowest level value., its target must drainDrainedThe ability is resolved instantly as described in its entry. Then, that die is placed on the adventurer's race sheet. It is unavailable for the remainder of the battle and is considered drained. 1 availableAvailableAvailable dice are the dice in your attribute rows that you can currently roll. CombatCombatCombat has 1 type of skill die which can be rolled in any battle form except Magic. skill die.
Does this skill effect companions?
Since this skill drains a Combat skill die, it does not have any effect against non-adventurerAdventurerEach character created by a player is an Adventurer. Each adventurer is a party member. units, e.g. companionsCompanionA companion is a unit that is under the ongoing control of either the entire party or a specific adventurer.
SourceDoes this skill still trigger if the unit is defeated during the engage, e.g. 'Reflect' damage dealt via items or abilities
After the engage does not trigger if the enemy is defeated, it needs to be on the board when the skill would trigger or else it doesn't happen.
Source