Ember Spirit is a really fun ganker / semi carry that can do a lot of damage in the mid / early late game. I've found this build to be really effective while playing him.
Important tips:
- Not a great lategame carry, so don't rush battlefury and farm all game
- Remember that you can use abilities during SoF. This means your spirit can travel farther, faster. You can also intiate with a bola from long range.
- TP trick is really useful.
- Shadowblade is SO GOOD, buy it! Nukes super hard in midgame.