Second Calidas Campaign

The Second Calidas Campaign was an Imperial campaign carried out by the Ardent Shields Space Marine Chapter against a cabal of Dark Mechanicus forces upon the forge world of Annihilation. The Chapter received unexpected help in the form of a Dark Eldar Kabal. However, the dark bargain they forged with these vile xenos in return for their help, may yet prove to be the Chapter's undoing.

History
Three millennia after the First Calidas Campaign, another group of warp-tainted beings tried their hand at taking the forge world. This time they would not be fighting daemons or even traitor Astartes, but Hereteks of Mars. This fight against the Dark Mechanicus would only end with the help from a very unlikely source - the Dark Eldar, in the form of the Kabal of the Sixth Heart. In return, their only request was for a planet that offered no strategic or resource value of any kind, at least to the Imperium, and some psykers. The Ardent Shields agreed, if a little put-off by the Dark Eldar's strange request as well as their reasons as to why they would want such things.