Quote Originally Posted by Blueyes View Post
One thing worth noting about Mountain Buster is that it has twice the radius of Shock Strike. Shock Strike has a radius of 3y which is rather small. In a situation where there are multiple adds, it actually may be preferable to cast Mountain Buster as long as you can comfortable get within melee range. (I'll still need to test those spells to make sure that is the case, but that is my understanding.)

Though, I will agree that Feather Rain could use some help. It does the same damage as Eruption, but over a period of 6 seconds instead of instantly. Objectively speaking, Eruption will always be superior. Feather Rain does have a slightly longer range (30y vs 25y) but that's hardly worth mentioning.
Mountain Buster is also physical, which means it could end up stronger than Shock Strike depending on which buffs and debuffs your party has access to. I also believe Feather Rain ends up being stronger than Eruption if you have some Spellspeed on your gear, since Spellspeed increases damage from DoTs.