"Hmmm... Ohp, I got it!" Nina muttered to herself, having just clung to the tree beast as she thought.
Nina conjured a Black Arm on top of the spiky log barricade blocking her way forward, the arm seeming to burst out from the log, but causing no actual damage, simply appearing and sticking to the surface between some of the spikes. The arm stretched itself out and formed a fireball in front of its palm, then launched fireball in the rough direction of the ETR team. The fireball was purposefully aimed wide, and would only hit any of the soldiers if they actively attempted to get hit by it. The arm repeated this act, launching staged "attacks" at nearly everyone outside. Nina hoped this ruse would cause everyone to retaliate against the arm and strike the barrier, thinking that a combined barrage could inflict significant damage.
While she waited to see the outcome of her plan, Nina held her mouth slightly open. A black, smoke-like substance leaked out, but instead of wafting off into the sky, flowed downwards and clung to Nina's body. The smoke would cover her entire body and stick to it, until after a moment her appearance simply looked like a featureless black silhouette.