Hail Storm is a Cabal Online skill learned by Wizard from class rank 6. Description as it appears in the game:
Summon a tsunami from the ground to attack enemies within range
| Classes that learn it | Wizard |
|---|---|
| Rank required | 6 |
Other Wizard skills at rank 6
These unlock at the same class rank, so the same quest gives you all of them: Blink, Force Hardness.
FAQ
What does Hail Storm do in Cabal Online?
Summon a tsunami from the ground to attack enemies within range
Which class learns Hail Storm?
Hail Storm is learned by Wizard. It unlocks at class rank 6.
How do I raise my class rank?
Through the class rank quests the game offers every few levels. Each rank opens new skills and, later on, the Battle Modes.