Performapal Camelump (CORE-EN005) - Clash of Rebellions 1st Edition

Pendulum Effect : Once per turn, during your Main Phase 1: You can target 1 face-up monster you control; the monsters your opponent currently controls lose 800 DEF until the end of this turn, and if they do, if the targeted monster attacks a Defense Position monster this turn, inflict piercing battle damage to your opponent. (These effects remain even if this card leaves the field.)
Monster Effect: If this card is destroyed by battle: You can make the monster that destroyed this card lose 800 ATK.