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These ruins of a former church now plagued by Scarlet Rot and overgrown Bloodroses lie southwest of the academy's southern entrance. You'll find White-Mask Varre standing outside, prompting you to join his order with the Bloody Lord.
Inside the church, you'll find an Assassin that will spawn from the ground if you get too close to the center. This church is also a great place to harvest Bloodrose for crafting. There is a small island to the church's northwest where you can grab the Bloodflame Blade Incantation from a Scarab.