Cathedral Level 1 · area boss

Ser Corwin Vane, the Oathbroken

the Oathbroken

A named threat of Cathedral Level 1, encountered rarely and never in numbers - real Dungeons & Dragons statistics, no auto-computed shortcuts.

CR 20 Undead · Undead 6 / Fighter 6 / Blackguard 8 resref cl1_corwin

Stat block

STR
26
+8
DEX
14
+2
CON
18
+4
INT
10
+0
WIS
14
+2
CHA
14
+2
Hit points
206
Natural AC
6
Skills
Concentration 18 · Discipline 14 · Intimidate 16
Feats
Cleave, GreatCleave, PowerAtk, IronWill, BlindFight, Toughness, ImpInit

Prepared spells

LevelKnown / Prepared
1Cause Fear, Doom
2BONEBLADE, Death Knell

Combat sequence

Layered on top of the module's own combat AI, which still picks targets and positioning. The fight below moves through real hit-point-gated phases; every save DC and attack bonus computes from the stat block above at runtime.

I

Grim Verdict

Above 66% hp

A stacking curse settles onto whoever he's fighting, judged and found wanting.

II

Hollow Oath

66%-33% hp

A dark blessing rolls through him, all take and no give.

III

Last Rites & The Broken Vow

Below 33% hp, and again on his own death

A fear pulse and a guaranteed smite - and if he falls, whoever struck the killing blow carries his broken oath home with them.

Why these numbers

CR 20 is set against Cathedral Level 1's own real ambient ceiling, not auto-computed from level alone - a genuine Undead 6 / Fighter 6 / Blackguard 8 build at 20 total levels.

Hit points (206) follow this project's own average-hit-dice convention, and every save/attack bonus derives from the ability scores above at runtime - nothing here is hardcoded past the phase gates themselves.

How it's wired

Boss-flagged (bypasses the drop-rate roll, two loot-generation passes) and gated to a single spawn - only one Ser Corwin Vane is ever up in Cathedral Level 1 at a time.