Between the Black Templars and this witch-cabal there is no peace — a nest of sorcerers, warp-touched and quick on their feet, that fights from a distance and leans hard on its powers. To the crusade it is the most hated quarry of all, and at the very same time the surest killer of a melee host: the foe that guts a charging tide before a single blade can bite. So long as the enmity endures, the Templars earn bonus Reputation for a clean win in which they close on the enemy caster and butcher it hand to hand; the cabal earns Reputation for each fight it spends holding the crusade off and grinding it down uncaught. Neither yields until one is chased from the world they contest. No pact is ever struck with the witch.
Codex · Space Marines
Alliances2
Whothe coven that will not close (a psyker-bearing, range-keeping force built to kite - a sorcerous cabal, a witch-led kill-team, a mobile shooting gang that leans on powers and distance; both the crusade's most abhorred prey and its single hardest matchup, the enemy that kills the melee tide before it lands)
Termscampaign-level feud: while it stands, the Black Templars gain bonus Reputation for a decisive win in which they reached and destroyed the enemy's psyker in melee, but the enemy gains Reputation for every battle in which it kept the crusade at range and bled it white without being caught; the feud runs until one side is driven off the contested world
Whothe faithful (a fellow zealot force of the Imperial creed - an Adepta Sororitas order, an Ecclesiarchy war-host, a Frateris levy, another loyal Chapter that shares the hatred of the witch; any army that fights for the Emperor's faith and abhors the sorcerer as the Templars do)
Termscampaign-level alliance: while it holds, the two forces share a crusade - the Black Templars gain bonus Reputation for a battle won by taking an enemy psyker or heretic Out of Action, and the faithful may lend a single zealot fighter or a blessing (a one-battle Willpower aura) to a Templars battle once per campaign phase; the alliance runs until one side leaves the crusade or the pact is broken
The Black Templars march in common cause with the devout — the Sisters of a Sororitas order, a war-host raised by the Ecclesiarchy, a levy of the Frateris, a brother-Chapter that loathes the sorcerer as they do. Whatever host takes up arms for the Emperor's faith and hates the witch with a Templar's fervour may stand in their line. As long as the accord lasts, the two wage a single war: the Templars draw bonus Reputation from any battle decided by cutting down an enemy psyker or heretic, while the devout may spare a lone zealot to fight, or a blessing — a Willpower aura that lasts one battle — to a Templar engagement, once in each campaign phase. The accord endures until one party abandons the war or turns oathbreaker.