Advanced format ruling
Elemental HERO Absolute Zero
Card effect (current official text)1 "HERO" monster + 1 WATER monster
Must be Fusion Summoned. Gains 500 ATK for each WATER monster on the field, except "Elemental HERO Absolute Zero". If this card leaves the field: Destroy all monsters your opponent controls.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.