Blueprint Drops? Vengeance Relic Blueprint and Nidalla's Outbreak Blueprint

Hey guys! Been all over the database in Grimtools and it doesn’t mention a monster drop or a vendor for either of these blueprints.

Does anyone know where to get them?

Try this: [SPOILERS] List of Bosses that can drop blueprints

If what you seek is listed, then this is your best bet, IMO.