Calista
Background
Former wife of the King and probably Blanche's mother.
DLC
If you succeed his first step, it'll trigger the cultists event. She'll kill Balaam at the end of the game if you haven't the sigil, preventing your death.
Harem
Blanche and Calista Harem, DLC Princess Harem, All Princess Harem.
Story guide
Step 1:
First you have to see Calista at the Haunted Manor before the 11th, if you don't, you will not be able to continue the story with her.
You need at least 7 in Prowess and 7 in Charm to succeed.
Be careful because you can't trigger it indefinetely.
Step 2:
You need at least 10 in Prowess, Knowledge and Charm to succeed the event.
Go to the Haunted Manor in the afternoon.
Step 3:
You need at least 13 in Prowess and Charm to trigger the event.
Go to the Haunted Manor in the afternoon.
Step 4:
You need at least 16 in Prowess and Charm to succeed the event.
Go to the Haunted Manor in the afternoon.
Step 5:
You need at least 21 in Prowess and Charm to trigger the event.
Go to the Haunted Manor in the afternoon.
Step 6:
Go to the Church in the afternoon to get the amulett of Lupercus.
Step 7:
You need at least 26 in Prowess and Charm to trigger the event.
Go to the Haunted Manor in the afternoon.
Step 8:
You need at least 30 in prowess and knowledge to trigger the event.
Go to the Haunted Manor in the afternoon.
(You can now marry Calista)