I tried to avoid the common sin of making them overpowered, but maybe the MR needs to be raised. It would be thematic too. Twiceborn warriors tear through stuff, and the Word Made Flesh has disease attacks, which are powerful against a lot of things.
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Great indebtedness does not make men grateful, but vengeful; and if a little charity is not forgotten, it turns into a gnawing worm.
The disease attacks are powerful vrs alot but their effect isnt exactly instant, dosnt spread and can only hit a max of 3 (human sized, the number decreases vrs cavalry/jotuns ect) enemies per turn. 460 gold is alot, maybe pop them down to 360 and raise all the undeads mr by 1 or 2.