Breakdown Epiphanies
One of the undead themes from the official soundtrack to Overhype Studio's "Battle Brothers", composed by Breakdown Epiphanies.

You can get the album in lossless quality on Bandcamp:
https://breakdownepiphanies.bandcamp.com/album/battle-brothers-original-soundtrack
Or on Steam:
http://store.steampowered.com/app/365380
['Battle Brothers', 'Soundtrack', 'OST']
Battle Brothers OST - Curse of the Emperor (Undead)
Music