Koshchei the Deathless Omnibus

The complete comics saga of the unkillable man and the Witchfinder who fight to defend what remains of the world after Hellboy. Sent to kill Hellboy by the Baba Yaga in Darkness Calls, Koshchei the Deathless hinted at a long and tragic life before being enslaved to the Russian witch. Now Koshchei relives every horrible act on his road to immortality and beyond, with none other than Hellboy himself-in Hell.
Then, after the end of the world above and the death of Hellboy, Koshchei is summoned by the Witchfinder Ed Grey to finish the one task he could not-take up his sword again and fight a dark foe hell-bent on destruction. Finally, Ed Grey is summoned by Alice, queen of the last standing realm on earth, to defend her and England against Morgan Le Fay and her champion in a final standoff. Grey must transform into the defender he was destined to be if England has a chance of surviving, while Le Fay has her own shadowy intentions.
Hellboy creator Mike Mignola and fan-favorite artist Ben Stenbeck team up for a final saga after the end of the world. This hardcover omnibus collects Koshchei the Deathless #1-#6; Koshchei in Hell #1-#4; Sir Edward Grey: Acheron one-shot; and The Serpent in the Garden: Ed Grey and the Last Battle for England #1-#3; plus all epilogues, a cover gallery, and sketchbook section.