Endeavour of Will
From Warhammer 40k - Lexicanum
The Endeavour of Will is an Imperial Fists Starfort.[1]
Alongside the Bastion Inviolate, it helps guard the region of Imperial space around the Eye of Terror from the forces of Chaos. The Endeavour of Will was attacked by the Iron Warriors Warsmith Shon'tu in 998.M41, leading to the Battle for the Endeavour of Will.[1]
The Starfort's Machine Spirit is quasi-sentient, able to communicate actively with its sister ship the Bastion Inviolate and even express regret when the Bastion sacrifices itself to save it.[1]