Would someone be so kind as to tell me which book has the void kraken in it? I would very much appreciate it.

Void Kraken is Kronos Beastiary.

The beast is in Koronus Bestiary, p36-37.

Wonder if, with a little tinkering, it would make for an interesting Tyranid organism. It could use Shadow in the Warp to blot out a whole area of space from navigation and astropathic communication. Granted, Tyranids are blessedly rare in the Expanse (hazaah), but it could be a terror for ships in the Orpheus Salient of the Jericho Reach, eating up Imperial, Tau, and maybe even a few Rogue Trader vessels. Might have nodes that could fire Warp Blasts/Lances, for ranged combat, before moving into crush-range, cavities filled with Gaunts and Genestealers, for boarding actions and dropping to planets, and maybe even a great Warp Field, to protect it, like a Void Shield.

In battlefleet gothic the tyranid had a frigate sized ship called a kraken. I was looking for the void kraken so I could base tyranid ships I design for my own games of what FFG did. I am hoping it is at least comparable. It might be a while before I can get my own copy of the bestiary though.