Pick two or three demons to see what the Cathedral of Shadows makes of them. 101Leafy researched the game for every rule on this page, so the calculator follows the same steps as the game, accidents included.
Result
Every way to make a demon
Every pair of two demons that fuses into the demon you pick, lowest levels first. Pairs that only work after a point in the story are in the list too.
How fusion works
Pascal comes first: with any demon he gives Cerberus at level 55, whatever the hero level.
A demon on the ban list can't be used. Some leave the list later in the story.
Then come the special recipes, two of the same demon, and the dark rules, used when either demon is a Vile or of a race after it in the list.
Last is the race chart. The first demon picked is the row and the second the column, and a few cells give a different race when the order is swapped.
The result can't be one of the demons fused. When it would be, the fusion turns into a Slime.
A result above the hero's level is refused. A law hero with a chaos result, or a chaos hero with a law result, can fuse it but can't summon it.
Race chart
Rows are the first demon picked and columns the second. Group means the lowest demon of the group at the target level, and an elemental in a cell is the result.
How many ranks an elemental moves a demon of each race. Plus is up, minus is down, and a dash means no fusion. Up past the top wraps to the bottom of the race.
