The afterglow does not intensify with the more weapons you have on also they dont stack. The afterglow effect is as follows:
Mythic > Relic > Empyrean
Mythic will override Relic and empy afterglow (only blueish afterglow with Aegis and Burgang)
Relic will only override empy afterclow (only goldish glow with Almace and Aegis)
Empy afterglow does not override mythic or relic (red only if empy weapon is on)
to check the stacking of the afterglow i used Aegis Ochain Burtgang Excal Almace, SSs below shows what the difference between the types, also the SSs where taken in game, i just swapped the DATs about
you can replace the DAT files if you want all M.Humes to glow that is wearing a emoy/relic/mythic. i have sorted it all out for you in to the relevant folders
M.Hume Dats (for non afterglow empy/relic/mythic)
Empy

Relic

Mythic

