Rules.
HQ Choice, 200 points (that's right he is that cheap and NOT a LOW!)
WS5 BS5 S5 T6 W5 I3 A3 LD10 2+ armour, 5++ invul (Refractor Field)
He may replace any Dominus in the formations from our codex. Cawl, Grayfax and Celestine may be taken as an HQ choice in a CAD or allied detachment for ANY Imperial Faction, no matter which faction those three actually come from. So yes, we could take Celestine etc. instead of a Dominus.
Arc-Claw-Thingy ("Bogengeißel"): Range:- S+1 AP4 Close Combat, Haywire, Master-crafted. Has a special rule that let's you re-roll the result on the haywire chart.
Master-crafted Power Axe
Mechandrite Hive: Cawl does 2D6(!!) S4 Ap- attacks at Ini 10 if he is in close combat. Doesn't grant an additional pile-in move. He also has a Dataspike, so potential 13 S4 AP- Ini 10 attacks, BEFORE he even starts to swing with his axe!
Scryerskull: At the start of your turn you can identify a mysterious objective anywhere on the map.
Solar-Atomiser: Range 12", S10, AP1 Assualt D3, Master-Crafted, Melter
Special Rules:
Warlord Trait is the one that let's him re-roll FNP rolls.
Special rule 1 (not gonna translate the German names for those): At the start of your turn, Cawl regains D3 wounds. Yep, no roll for this or anything, he just gets them back!
Canticles Of The Omnissiah
Canticles Of The Archmagos: Only work if Cawl is alive. Work just like the other Canticles but also influence any Imperial vehicles that are within 12" of Cawl, even if they don't have the canticles special rule.
Harmony Of Metallurgy
1-3 IWND
4-7 IWND. Roll two times for IWND instead of one time
8* IWND. Roll three times for IWND instead of one time (so any vehicle etc. could regain 3 wounds from this!)
Word Of Neutralisatoin
1-3 BS+1
4-7 BS+2
8+ BS+3
Warhymn Of the Machine God
1-3 6+ Invul save
4-7 5+ Invul Save
8+ 4+ Invul Save