Judicator, Leviathan by Serban V.C. Enache

Hera is sent by the Inquisition to a feral planet on the fringes of the galactic East, there to investigate a Warp anomaly. She takes a Sergeant, a Super-mutant, and a Technomancer for the mission. They discover a tribe of primitive humans, pure of gene-stock, who worship a giant, alien craft made of beautiful, horned ivory. Her team begins to explore the xeno construct, for within its caverns lies the source of the mysterious Warp signature… Hera must face hideous slime crawlers, betrayal from the higher ups, uninvited looters, a Raxxar invasion fleet, and planet-wide chemical bombardment.