Originally Posted by
klausi
Later massacres are most likely all followed by a feud, so judging by your rdps, the enrage timer or the boss%hp you stop dps early or later on. You want to bring him to 21.5-22% and wait for a massacre, clump up while it's casting and use tranq/divine hymn etc right afterwards. After that's done you push him to the 20% transition w/o getting any caustics - it's always 14 seconds from massacre hit to the next wave of caustics - hit hero (he receives 10% more damage during this phase) and pop your 1200 stat potions as well.
Note: If you push him while entering a feud phase you should be aware that it takes another roughly 10s after the transition until the bot is up and running again so you might lose a tank.