Many players had asked for such a feature to be implemented after the original game's release, and various mods were released to fulfill this. In the PC version of Resurrection of Evil, as well as in any version of Doom 3, players cannot wield a flashlight and a weapon at the same time, forcing them to switch constantly between the two. The Xbox version adds an exclusive new feature to the gameplay: the flashlight is now attached directly to a weapon.

This effect is notable, as something similar was originally introduced as the key new gameplay element of Max Payne, and later used in the 2005 game F.E.A.R. The most frequently commented on is 'hell time', an effect that changes the player's perception to be one of slow-motion, except for the player's own movements. The Artifact has three abilities, each of which becomes available after defeating one of the expansion's first three 'boss' monsters. The second additional feature is the Artifact. This makes it the best weapon for defeating several types of monsters, including the Lost Soul, Cherub, and Trite, which it can throw and kill outright, and the Imp, Cacodemon, Hell Knight, and Vulgar, whose projectiles it can catch and throw back. The third, and by far most important in terms of its impact on gameplay, is that the Grabber can catch and throw projectiles and small creatures, whereas the Gravity gun cannot. The second is that the Grabber creates a distortion effect that can obscure the player's vision when in use.

The first is that the Grabber has a limited charge, and thus can only hold onto an object for several seconds. There are three major differences between the Grabber and the Gravity Gun.

The developers have commented that the tool was originally in Doom 3 before Half-Life 2, and was used to create 'damaged' rooms instead of building a ruined room, they would build a pristine room and use the grabber to 'damage' it realistically. Resurrection of Evil has come under some criticism about the use of the Grabber due to the prior popularity of the similar weapon in Half-Life 2. It also allows the player to catch fireballs and throw them back at the enemy. The Grabber, like the ' gravity gun' from the game Half-Life 2, is a physics-based weapon that allows the player to pick up and move certain items. The first, is a tool that was originally developed for Doom 3 'the Grabber'. Resurrection of Evil adds in two new main features to the gameplay that the player can use throughout the game.

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