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Half-Life: Opposing Force Hints
Displacer
The displacer is a very interesting experimental weapon. Its primary attack shoots out a glowing orange orb that will do severe damage to anything within its blast radius. The secondary attack, however, will displace you in space. In single-player, you will end up displaced to the alien world Xen, where you can grab some supplies and then return near where you left by nearby portals. In multi-player, you are merely displaced to some other position in the level.
The displacer takes nuclear battery packs and its "ammo" is really the percentage of battery power left in the weapon. Primary attacks take 20% of the battery power and secondary attacks (displacements) take 60%. Gather new batteries to restore power to the displacer. The displacer can be used underwater.
