Slipskull

Slipskulls are a cunning and opportunistic strain of the Chimeran species who prefer to take pot-shots and make blind-siding attacks on their enemies rather then face their opponents directly.

The Slipskull is a fast enemy, and have the advantage of clinging to walls. This makes the Slipskull a difficult target to hit. Their speedy and stealthy forms make them excellent scouts as well as ambushers. Once detected, it is necessary to eliminate these creatures as soon as possible before they summon reinforcements.

Explosives are believed to be the recommended way of dealing with these creatures, however, Hybrid Bullseye rifles and the Slipskulls' own Reaper Carbines are also suitable.

Appearances
In Resistance: Fall of Man Slipskulls first appear in the level Cheshire, No way out.

The Slipskull returned in Resistance: Retribution but did not appear in Resistance 2. Though in Resistance: The Gathering Storm, Slipskulls are mentioned to have been appearing during the height of the Chimeran invasion of America.

Tactics
To combat the Slipskull's great speed, using the Fareye's secondary fire is ideal. Also, the Slipskulls almost always stop moving in the same places, so it is easy to preempt where they are going to stop and start shooting at you. In this instance, tagging the Slipskull with the Bullseye when they stop moving allows for a quick and easy victory. Even better is using the Reaper Carbines (2nd playthrough only), as they home in on the enemy without needing to tag them. As the Slipskull fights in groups of about 5, it helps that you can aim at two at once.

In Resistance: Retribution, a laser beam similar to the beam shot by the L206 LAARK's secondary fire will show you where the Slipskull is aiming.