Spirits - starting

spirits are best in middle imo.

Level 1 you build 3 restrained spirits with a half space in between, that's how i feel they perform they best.

Level 2 you have to upgrade a spirit on each side, it's expensive, for now your push will suffer a little - but even with this, you will still be vulnerable to a send or bad positioning

Level 3 you only need to upgrade the last spirit and you should be fine, should also be fine against most sends if game hasn't been delayed in the early game.

Level 4 it just still holds. If you have options to get away from spirits after making 3-5 probably try to do so, but it is possible to go spirits for a long time, especially with a small spam unit like peasant / gnoll