Quote Originally Posted by RinchanNau View Post
Has anyone here done the math/testing or have a link to someone who has? Curious as to their findings. Thanks!
It's not even necessary to do testing. The math is pretty simple. Miasma II is 70 potency therefore it is always better to use Miasma II over Ruin whenever there is 2+ enemies (total 140 potency vs 80). If it's a single target boss fight then there's no real need to use it except when both Raging Strikes and Contagion is up (unless you want l33t DPS, then you can use it whenever Contagion is up).

Tri-Disaster is a skill for solo play. DoT up enemy, Bane, Swiftcast Tri-Disaster and watch them die over the next 20 seconds. Or if you're being mobbed by FATE monsters... bind + run for your life. In dungeons, you can also use it to bind Garuda's plumes in HM, or lock out enemies from boss rooms. In PvP the usage is obvious.