xda thread: https://forum.xda-developers.com/android/apps-games/root-black-t3815445/post77053067#post77053067

FUNCTIONS

•Switch between Dark Black(on some roms) and light theme using shortcuts
•Setting brightness to to minimum will enable selected dark theme and switch back to light theme when brightness is set to max
•Automatically switch to dark theme when nightlight enabled on AOSP 8.1/9 ROMs
•App shortcuts and quicksettings Shortcuts to manually switch between Dark and light theme
•DO NOT SELECT BLACK THEME IF YOUR ROM DOES NOT HAVE A DEFAULT BLACK THEME

Depending on your ROMs when the default themes are set it would disable all your applied substranum themes on your system ui and android system


POTENTIAL FEATURES
•Support for Linage Based ROMs
•Scheduled theme changing
•Theme changing based on battery
•Speed up only unlock animation on all ROMs
•open to suggestions

BUGS
•UI bugs on small dpi's

This would have not been possible without Tasker