Reaper-17’s vehicles are the best compared to the other Scrin sub-factions, such as their more powerful Shard Walkers, and their Reaper Tripods. This ground force supremacy comes at the cost of air strength – Reaper-17 can only build Stormriders.
Units

Shard WalkerMore effective that the standard Gun Walker, Shard Walkers fire tiberium shards for added damage, and can be upgraded with Forcefields and Blue Shards.

Shielded HarvesterReaper-17 Harvesters are shielded upon creation for protection. They also create Ion Storms when destroyed.

Reaper TripodThe Reaper Tripod can charge up its attack beams by draining Tiberium crystals, much like the Devourer tank.
EradicatorThe epic unit of Scrin, the spider-like Eradicator easily crushes vehicles underfoot and collects resources from each enemy unit destroyed nearby.
Upgrades
Attenuated ForcefieldsThis early upgrade gives seekers and gun walkers weaker forcefields for added armor.
Blue ShardsShard Walkers do extra damage.
Conversion ReservesReaper Tripods and Devourer Tanks can carry more Tiberium to charge up their shots with.
Buildings
Warp ChasmThis new building is required to build the Eradicator. It can also build and repair vehicles like a normal War Factory.
Support Powers
Tiberium InfestationPlaces a building on a tiberium field (much like a growth accelerator) that “infests” the field and heavily damages all enemy units foolish enough to move onto the field. Affects harvesters as well.
Shock PodsThis power calls down a couple squads of Shock Troopers.
Ichor SeedCreates a small, regenerating field of Tiberium.
Overlord’s WrathCalls down a tiberium meteor storm to the targeted location, dealing high damage.
Other Notes
No Planetary Assault Carrier, Devastator Warship, Mastermind
More expensive Storm Riders