If all monsters you control are "Windwitch" monsters (min. 1): You can Special Summon this card from your hand. You can only use this effect of "Windwitch - Freeze Bell" once per turn. Once per turn, during your Main Phase: You can increase this card's Level by 1. A WIND Synchro Monster that was Summoned using this card as Synchro Material cannot be destroyed by battle.