Hydromancy is the magic of the runic element, water. 

Effects on Magic Damage: 

Double runic energy for magic attacks done against those of the fire element.

Effects on Magic Defense: 

1d8 reduction in to Fire and Water Magic Damage. Impossible Arcana Check for full immunity to Fire and Water Magic. 

Supportive Effects: 

+2 to Immunity

Affinities: 
Water, Desert
Months: 

Yayannie, Marpegoth

Runic Element Tag: