The BFG was replaced in ID's latest Quake game, "Quake 4", by the "Dark Matter Gun". It is the last weapon to be collected as the player progresses, as can be expected. It is similar to the BFG9000 in that it delivers massive damage to anyone who even thinks about it, but quite different in its mechanism. As it charges, a puple-ish orb of nothingness grows within a set of spinning gyroscopes on the top of the gun, and once charged this orb can be fired towards whatever your heart desires (as long as it's not too close, or you'll soon regret it). Upon impact with a solid object the orb explodes satisfyingly (not the usual orange-fire explosion variety, but more a rapid expansion of purple haze and, well, all the nothingness), but as it moves sluggishly through the hazy Stroggos air it acts as a sort of black hole, sucking enemies, barrels and everything else in. Ammunition is scarce, and they are aptly named "Dark Matter Cores". Both the Makron and Lt. Voss' Strogg form carry a Dark Matter Gun, making them able to throw the player around as well as fill him with ridiculous numbers of bullets.