Superheavy Samurai Soulfire Suit (NECH-EN010) [The New Challengers]

You can target 1 "Superheavy Samurai" monster you control; equip this monster from your hand or your side of the field to that target. Its level becomes 5. During either player's turn: You can discard this card, then target 1 Defense Position "Superheavy Samurai" monster you control; until the end of this turn, it loses 800 DEF, but cannot be destroyed by battle or card effects.