Unlocking 5th unit in AR

IDK the lightning trap is like a Rose, in that it's pretty that it deals good chip damage but it can easily poke you with that chip damage also especially since it's really easy to manipulate AI to move all of them close to hit to get hit by it, I say try not to go any higher than lvl 2 on it because 30 flat damage is already strong enough to get most units to around 50%, a 5th team member would probably be better since it can couse the battle to prolong long enough to have them lose