Pure harbinger/eater tree?

Is there a good tree to do only harbingers/eaters and block literally everything? I don't want to deal with ANY league mechanic but not sure if there's a good way to block everything and benefit from it

Harbinger isn't considered extra content meaning blocking mechanics doesn't really interact with it. Instead it will increase the chance for strongboxes, tormented spirits and rogue exiles since they can't be blocked but count as extra content.

The other issue is that altars scale mostly with pack size. To increease pack size you want to generally use a combination of grand design/wandering path and growing hoards which you can't do because they don't work well with harbinger.

Example tree:


https://poeplanner.com/a/H5g

Remaining points can go into:

- Map mod effect for quant/packsize
- Connected map drop chance
- Singular Focus if your sustain is high enough
- Shaper/Elder/Conq/Synth map drop chance (if you're not going singular focus)
- Map duplication
- Strongboxes (since you're going to have them anyway)
- Delve (just for buying 1socket resonators and movement speed)

Everything else requires to actually play a league mechanic or isn't worth the effort imho.

Thank you for the response. Currently I'm running harvest, strongboxes, eater and harbinger in tower with divination, ambush, harbinger and reliquary scarabs, but sacred grove usually spawns near the entrance of the map which forces me to backtrack since it's best done after all quantity altars are picked up and I don't wanna backtrack all the way to the entrance. And I'm getting very good returns on harbinger maps with gilded scarabs and harbinger sextants so I thought why not just block everything and go all in on harbinger