Advanced format ruling
Dark End Dragon

Card effect (current official text)1 Tuner + 1 or more non-Tuner DARK monsters
Once per turn: You can target 1 monster your opponent controls; this card loses 500 ATK and DEF, and you send that target to the Graveyard.
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.