The fourth crossbow is definitely primarily for team play.
Medium – 1 turn.
Abilities give a minus to the base accuracy; both cannot be activated at the same time.
It won't remove Berserk. Berserk is not a positive effect.
Aura works in any conditions.
I'm not sure if the crossbow needs buffs. It's cheap and weak...
Added 3 minutes ago
Stats don't affect the beast. You can't cast spells. The companion is a basic animal.
Added 7 minutes ago
The range is approximately. 10-12-8 respectively, I think.