Predecessor Builds > Zarus > Zarus Support/Regen

This build tends to work when you are up against a carry who has no mobility (aka Sparrow) and you have a Kira or Twinblast.

If you can, stack your ultimate ability on every kill, assist you can as it starts to scale off some of the physical power items in team fights late game. It is also worth mentioning that this is a very situational build and your items can change drastically based on the team comp. I would recommend always getting raiment of renewal second though as it allowed for consistent healing and works alongside your passive for persistent sustain if you are being aggressive.