Did you ever think Half-Life was way too easy? Hard-Life corrects that issue.
A few mods have added or attempted to re-add the Kingpin to Half-Life. There have been some interesting takes, but I felt that most of them didn't fit in-universe or just weren't particularly scary. This guy is a very rare occurrence, but I hope you brought your A-game.
KILL IT WITH FIRE!
That thing is nightmare fuel for the nightmare truck driving on the nightmare road into the nightmare canyon.