Rain is intended for the Druid class. It provides a boost to maximum Mana and Mana recovery from damage, which an Elemental Druid may find useful.
5% Chance To Cast Level 15 Cyclone Armor When Struck
5% Chance To Cast Level 15 Twister On Striking
+2 To Druid Skills
+100-150 To Mana
Lightning Resist +30%
Magic Damage Reduced By 7
15% Damage Taken Goes to Mana