From wow.incgamers.com

Statistics

Talent Improvements

The talents below affect Rain of Fire in the following ways:

Destruction Tree

Talent: Pyroclasm
Effect: Gives your Rain of Fire, Hellfire, and Soul Fire spells a chance to stun the target for 3 sec.
Statistics: Rank 1 = 13% chance, Rank 2 = 26%.

Talent: Ruin
Effect: Increases critical strike damage bonus of Destruction spells.
Statistics: 1 point = 100% increase

Talent: Cataclysm
Effect: Mana Cost of Destruction spells reduced.
Statistics: 1 point = 1% reduction, 2 points = 2%, 3 points = 3%, 4 points = 4%, 5 points =5%

Threat Level

Details of threat level generated by Rain of Fire.

Uses in PvP

Please feel free to add a bullet list of uses within PvP or editorial if you have more to say. What use is it against other builds, what skills can it be used to counteract or prevent. What skills does it work well in combination with.

Uses in PvE

Please feel free to add a bullet list of uses within PvE or editorial if you have more to say. Which creatures/bosses in particular is it useful against.