BLM

[Rbstr]

Yeah I typoed. it's 34%
5% per tick. That's a 95% chance per tick nothings happens.
But you get 8 ticks per Thunder 3.
So .95^8 = .66. That's a 66% chance that over all 8 ticks of thunder 3 that you don't get a proc.
So per Thunder 3 cast you will proc 34% of the time.

This is how independent events work.
Say you're rolling dice. You want to roll a 1, that's an 1/6th chance ~16%. If you roll the dice 2 times you have two 16% chances for a 23% chance you will roll a 1 over your two tries.