Hydra Scale

Hydra Scales drop from the following hydras in Nazjatar:
 * Scale Matriarch Gratinax
 * Siltridge Hydra
 * Siltridge Marauder
 * Stonemaw Devourer
 * Stonemaw Hydra
 * Voidscale Hydra
 * Voidscale Trenchstalker

Objective of

 * Turn the Scale