This is the first build I've created on my own and wanted to share it as not many people are using Widowhail + the new Spinehail quiver. Got inspiration for this build from poopbutts2200's video on the quiver when he mentioned alberon's strength stacking as a way to supplement flat damage when you are using Widowhail. Mostly just a traditional strength stacking wander thrown into a bow build.

The main interaction is using Herald of Purity to spawn sentinels, which (after your first attack) will give you 100% uptime on Spinehail's sacrifice a random minion to fire 3 additional arrows mod, getting multiplied up to 10 by a high-rolled Widowhail. I tested using Summon Phantasm instead of purity in order to save reservation, but I found that it had a worse uptime on clearing and especially on single-target, so I stuck with Herald of Purity.

Put a good amount of money into the build trying to convert it to do risk-farming but am giving up and investing in something else. The build is definitely T17-regex and ubers capable. I got it to level 98 before going full headhunter build, but it is definitely playable and super fun without.

Current PoB (attempted risk farmer, no crit, triple ele flask for ele weakness maps/altars)

https://pobb.in/8ClaZ5p_LhGS

Aspirational PoB (could definitely be better, maybe MB for crit. i did not fix resistances in this pob)

https://pobb.in/Zt2lf7cqg0Wh

"Budget" PoB (no hh, progenesis, or wine of the prophet. got to level 98 with this setup. strength stacking still has an upfront investment though. Would recommend using traditional silver/quicksilver/quartz flask setup for faster mapping, but hitting res cap is hard)

https://pobb.in/PEfLRgB9ZTBm

I think there is a lot more potential for the spinewidowhail setup by using thunderfists for added flat lightning (couple on poe.ninja doing this already), abyss jewel stacking, or the new rallying cry merc tech for flat phys. This is my rendition though and is super fun to play.

Happy to answer any questions