Mods can do practically anything. Looking for a bigger challenge in an already difficult game? These examples will likely satisfy.
Subscribe for more: http://youtube.com/gameranxtv
Kingdom Come: https://www.nexusmods.com/kingdomcomedeliverance/mods/447
Fallout New Vegas: https://www.nexusmods.com/newvegas/mods/38719/?
Resident Evil 2
Dark Souls: https://www.nexusmods.com/darksouls/mods/1418
Darkest Dungeon: https://www.nexusmods.com/darkestdungeon/mods/57/
Skyrim: https://skyrimsurvival.com/home/frostfall/
Doom: https://www.moddb.com/mods/brutal-doom
STALKER: http://themiserymod.com/
XCOM: https://www.nexusmods.com/xcom/mods/88/