Inquisitors are fine, honestly. They shared a book for the better part of 3 editions after all. Personally, I don't ally, and if I did, I'd probably go with GK because I used to do that back in the days of C:W/DH.
Here's my potential 1500 with relay pipes.
+++ Goodness Gracious (1500pts) +++
Great Walls of Fire
++ Adepta Sororitas: Codex (2013) (Combined Arms Detachment) ++
+ HQ +
Canoness [Combi-Flamer, Rosarius, Storm Bolter, The Litanies of Faith]
Saint Celestine
+ Troops +
Battle Sister Squad [2x Battle Sister, Battle Sister with Flamer, Battle Sister with Heavy Flamer]
····Immolator [Storm Bolter, Twin-Linked Multi-Melta]
····Sister Superior [Bolt Pistol, Boltgun]
Battle Sister Squad [2x Battle Sister, Battle Sister with Flamer, Battle Sister with Heavy Flamer]
····Immolator [Storm Bolter, Twin-Linked Multi-Melta]
····Sister Superior [Bolt Pistol, Boltgun]
+ Fast Attack +
Dominion Squad [4x Dominion with Meltagun]
····Dominion Superior [Bolt Pistol, Boltgun, Upgrade to Veteran Dominion Superior]
····Immolator [Storm Bolter, Twin-Linked Multi-Melta]
Dominion Squad [4x Dominion with Meltagun]
····Dominion Superior [Bolt Pistol, Boltgun, Upgrade to Veteran Dominion Superior]
····Immolator [Storm Bolter, Twin-Linked Multi-Melta]
Seraphim Squad [4x Seraphim, Seraphim with Two Hand Flamers, Seraphim with Two Hand Flamers]
····Seraphim Superior [Bolt Pistol, Bolt Pistol, Melta Bombs]
+ Heavy Support +
Exorcist [Storm Bolter]
Exorcist [Storm Bolter]
Retributor Squad [4x Retributor, 4x Retributor with Heavy Flamer, Retributor with Simulacrum Imperialis]
····Retributor Superior [Bolt Pistol, Storm Bolter]
++ Fortifications and Stronghold Assault (2013) (Fortification Detachment) ++
+ Fortification +
Promethium Relay Pipes
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