Railgun

Exosuit arm. Charge and release a piercing shot, with damage falloff past mid range and less damage on each target it pierces.

The Railgun is the arm of the Dual Railgun Exosuit. Hold the fire button to charge, release to fire. Each arm is charged and fired separately.

How it fires#

Charge: full power after 2 s. A held charge fires on its own after 3.3 s.
Time between shots: 1.3 s per arm.
Damage falloff: full damage up to 10 m, dropping linearly to 60% at 25 m and beyond.
Pierce: the shot passes through targets. After each target, damage to the next one is multiplied by 67%. Friendly players count; marine buildings, ARCs and MACs do not.
Hit detection: the shot hits players with a 0.3 m wide trace at every range, but map walls only stop it on the thin centre line up close (0 m to 10 m), 0.10 m to 20 m, and 0.30 m beyond. You can shoot through narrow gaps at close range. Eggs are hit too.

Full-charge railgun damage by distance, and on a second target behind the first.

Railgun damage is structural (×2 against structures). With falloff a full-charge shot does:

Full-charge shots to kill within 10 m:

Target	W0	W1	W2	W3
Skulk biomass 1	1	1	1	1
Skulk biomass 9	1	1	1	1
Skulk biomass 9 + Carapace	1	1	1	1
Gorge biomass 1	2	2	2	2
Gorge biomass 9	2	2	2	2
Gorge biomass 9 + Carapace	3	3	2	2
Lerk biomass 1	2	2	2	2
Lerk biomass 9	2	2	2	2
Lerk biomass 9 + Carapace	2	2	2	2
Fade biomass 1	3	3	3	3
Fade biomass 9	3	3	3	3
Fade biomass 9 + Carapace	4	4	3	3
Onos biomass 1	11	10	9	9
Onos biomass 9	14	13	12	11
Onos biomass 9 + Carapace	17	15	14	13

Alternate arms: charge the second while the first recovers.
Railguns are strong against lerks and fades at mid range. Past 25 m they lose a lot of damage, so move up with your team.
A railgun shot through a line of skulks hurts each one less (67% per target already hit).