All credits on addon, i decided created this addon because i have created same on Doom 64: Retribution
This addon adds new monsters, weapons and changes original monsters like Spidermastermind, Chaingun Guy, Revenant, Hell Knight and Cacodemon.
Optional heavy files below
Alternate HD Textures by Skiner111: Allfearthesentinel.net
HD Textures for Doom Complete: Allfearthesentinel.net
Changelog v1.1:
Added new monsters they are Annihilator, Bruiser Demon and Arachnobaron