Defensive Gi

Zoto,Ken,and Natsumi all get this power in Episode 16.

Defensive Gi(守備的なギ, Shubiteki na Gi) is where a magical gi(我為なギ, Wagatame na Gi(as said in the Japanese anime)) forms around the user.It protects the user against the next attack from the Ents.

What the user has to say to activate it is "Eat a magical gi, and that will protect you against the Ents"

In the Japanese anime it's: 魔法使いを食べる、エントに対してあなたを保護します. (Mahou tsukai o taberu, ento ni taishite anata o hogo shimasu.)