This is not for Sam-sung or OOS stock roms! Know how to recover your device before using Subs, as I am not responsible for what you do with your device! I can only test on Nexus and Pixel devices, but this should work on any device with a custom AOSP Rom with support support. Pixel 2 users (and perhaps also Pixel 1 users) using 8.0 Oreo Stock rom should simulate that they are on Android Oreo 8.1 and choose Android Oreo 8-1 from the main roulette.

Supported Android
(6.0 & up
Marshmallow (6.0 – 6.0.1),Nougat (7.0 – 7.1.1),Oreo (8.0-8.1), Pie(9.0)

Download Dark Infusion Substratum Theme for N, O and Pie 18.6 APK Patched

Dark Infusion v18.6 P.apk