Title is pretty self explanatory. I was reading the new 7.1 changes for the next build when I saw:
Rain of Fire Calls down a rain of hellfire, dealing [ 400% [ 444% of Spell Power ] Fire damage over 8 sec to enemies in the area. Warlock - Destruction Spec. 3 Soul Shard. 35 yd range. 8 sec cast (Channeled).
So it will be a channeled spell instead of instant? :L
And I fucking loved rain of fire instant cast. T_T