My opinion: Solo both portals at the same time. Maybe send an extra in for a few seconds to fire off a few rockets then leave if the two soloers aren't 100% competent at soloing. This is easily the quickest most efficient method IMO.
These are the 3 main strategies ive seen used with only mild variations, so if you use a method similar to one of the above vote for that one.
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Edited by Blocksystem: 11/26/2014 7:28:51 PMMy personal strategy: 1. Everybody, on the count of 3, spam all their snipers into the eye of the first Gatekeeper, and kill him before he teleports, Once he is dead, take out the hobgoblins, and everybody run left side. 2. Send 3 people into the (usually I do left) portal and kill the gatekeeper as fast as possible with snipers and rockets. 2 people provide cover fire for the third person as they grab the relic, cleanse, and run back through the portal. 3. Repeat the same thing with the other portal, send 3 people in to kill the gatekeeper. Person who has the relic from the first portal can simply stay outside and kill Vex spawns, until the second relic is out of the second portal. 4. defend the conflux with the two relics, tadah time to kill atheon