Advanced format ruling
Rockstone Warrior
Card effect (current official text)You take no Battle Damage from battles involving this card. When this attacking card is destroyed by battle and sent to the Graveyard, Special Summon 2 "Rockstone Tokens" (Rock-Type/EARTH/Level 1/ATK 0/DEF 0). These Tokens cannot be Tributed for a Tribute Summon.
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.