Half-Life 2: Episode One

Half-Life 2: Episode One is actually part 2 of the Half-Life series.

It also adds some Hunters. Woo.

Vortex Hopwire Grenade
62Dlheh5HbM This "weapon", also nicknamed the Black Hole Grenade, can be spawned through the console. It is very powerful, drawing everything nearby into it before collapsing and killing enemies instantly. However, it is glitchy and has an unfinished model; it re-uses the Rollermine model.

If used too near Alyx, it can kill her and spawn endless model copies, and often crashes the game to the desktop.