Cardinal Mathias Boss Guide — Crimson Moon's Archspire Cathedral Fight

Who is Cardinal Mathias?

Cardinal Mathias is a Vessel — one of Crimson Moon’s district bosses — fought in Mission II: The Archspire Cathedral. Community lore describes him as the acting leader of the Archspire Chapter, manipulated from the shadows in the game’s larger vampire conspiracy (see the bosses roster for where he sits among the Vessels and Dead Gods).

He is also the fight both major pre-launch previews ended on: Game Informer’s March hands-on called him “a bat/vampire-looking human” who “leapt around a church with acrobatic attacks”, while RPG Site’s preview described “a large, agile zombie with an equally large weapon”. Two independent previews, one conclusion: an agile, aggressive climactic duel.

Where do you fight him?

Inside the Archspire Cathedral, the gothic heart of the district that shares its name. Like every Crimson Moon boss arena, it is a authored set-piece at the end of a Ward’s mission chain — reach it by fighting through the district’s replayable missions, as explained in how runs work.

What is the fight like?

Both previews describe the same shape — a fast, vertical, acrobatic duel:

How do you beat him?

Three rules, drawn from how previews survived the fight:

1. Punish landings, not leaps. His acrobatics are the threat window for him — your damage window is the beat after he lands and before the next swing.
2. Save your Angel Mode for the dangerous phase. Game Informer’s preview describes it as “an overpowered state that boosts your range and movement speed” — and their reviewer used it to turn this exact fight when it was going wrong. Don’t spend it on the opening; bank it for when the pressure spikes. The full transformation system is covered in the Angel Mode guide.
3. Budget your lives. Previews confirm an extra-lives system (you resurrect in place, earning more through progression) — but every death still costs run resources. Play like the lives don’t exist, per the beginner guide fundamentals.

What build should I bring?

An answer to his speed, not his health bar: a Weapon Art you can land from range during his recovery beats, a defensive armour layer that forgives one misread leap, and Boons that keep your flasks full for a long second phase. Match all nine gear slots to a punish-and-reposition gameplan rather than maximum aggression.

Is he harder in co-op?

Probably easier to control, but costlier to fail: co-op runs on a shared failure budget, so one player eating leap after leap drains the team’s entire attempt. Assign roles — one baits the leaps, one punishes the landings — as covered in the co-op guide.

What does Cardinal Mathias drop?

The community wiki catalogues one weapon from this fight: Defiled Night, a polearm — described there as the ceremonial staff Mathias himself carried into the Archspire Cathedral — whose Weapon Art is listed as Cardinal’s Staff. That single-source catalogue entry is the complete known drop list so far; how drops persist via Purification is in the loot guide, and every boss-sourced weapon is mapped in the weapons list.