1 tau red shard (15% ability strength)
3 violet shard (30% electric ability damage)
Ether 1 blue shard (50 energy) or yellow shard (25% cast speed)
All shards can be tau if have them but not needed

100% armor strip
Has 811 shield r/s
With [Adaptation] and double back up has effective 121333 shield
Use of Augur mods from secondary and pillage has max shield gate

Only downside is inital start of cathode grace.
I use [Nautilus] to help group for start up and cc later on.
Epitath for priming to proc cold, viral, blast, and elctric.
Then really any good primary for when abilitys get shut off, archons, and/or acolytes.