The House of Devils found SIVA and used it for their own gain. Above is the Splicer Captain.
Dregs
Vandal
Scorch/Arc/Null Captain

Every Fallen House has Splicers – body hackers and bioengineers who fuse
metal and flesh – but the Splicers of the House of Devils have
uncovered the ultimate technology: SIVA, a Golden Age breakthrough in
self-assembling, self-replicating nanotechnology. The Fallen have always
worshiped machine gods. Now, armed with SIVA, the Devil Splicers are
becoming machine gods themselves. Confront the Fallen Devil Splicers in
the Plaguelands, find the source of the SIVA, and contain the outbreak
at any cost.