An standart [Sevagoth] shadow build with more energy reserve to make it an utility reaper or an deadly one

Just use 1 and 3 as much as you want but dont forget to heal
[Preparation] is better due to being unable to start with a good amount of energy, better if using [Primed Flow] and some energy shards

Archon mods arent affected for [Sevagoth] [Shadow Claws]... Only use [Archon Continuity] or [Archon Flow] if you dont have their primed versions

Arcane reaper lets [Sevagoth] shadow tank and [Regen] a lot of damage without ever using 2, be ware though... Bringing arcane reaper wont benefit it's dying passive
If you dont find arcane reaper useful, there still are other arcanes around like arcane [Guardian]

(Equipping archon shards on [Sevagoth] himself also applies on it's shadow)
You can drop augur secrets (or primed flow if your energy shard grants enough energy or/and using arcane steadfast) for [Stretch] for a more utility based [Sevagoth]