Stone Cloud is an Earth-elemental spell in Seiken Densetsu 3. It is a Level 3 attack spell that has a chance to Petrify the target. Angela can use the spell if she becomes a Rune Master (dark-light path). The Basilisk Fang item simulates the effect of this spell.
Note: If all enemies are Petrified, the game will consider you win the battle. If you use it on Earth elemental enemy, the petrification effect will get reflected to Angela.