Urn of Souls

Effects

On use, Isaac pulls out (or puts away) the urn; holding a fire button when it's pulled out emits a stream of blue flames in whichever direction Isaac is aiming. Each flame deals 22.5-31.5 damage per second, depending on how far it's traveled, plus an additional 4.5 damage per second times floor number. Multiple flames can damage the same enemy simultaneously.
- Isaac is also pushed backwards slightly while using it.
- The flames destroy enemy projectiles, poop, and other fires, but bounce off rocks.
Killing enemies grants a soul charge to the Urn, up to a maximum of 20. Killing bosses grants a larger boost. Charges must be used to power Urn of Souls, with each charge being equivalent to 15 flames over the course of half a second.

Can be fired diagonally, or in any direction if using a gamepad or mouse controls (the latter being enabled in options.ini).
The Urn can't be used to destroy (Shopkeeper) Shopkeepers, unlike The Candle and Red Candle.
Multiple Urns share the same charges.
(Bethany) Bethany can use her soul charges to fuel the Urn. Likewise, (Tainted Bethany) Tainted Bethany can use her blood charges.

Angelic Prism: Flames can be split into four multi-colored flames.
Bird's Eye / Ghost Pepper: The urn can emit flames from these items. Ghost Pepper flames are indistinguishable from Urn of Souls flames, but persist on the ground for longer.
The Book of Belial + Birthright as (Judas) Judas / (Dark Judas) Dark Judas: The stream of fire is replaced with a controllable Brimstone beam that deals more damage the longer it's active. The damage ranges from 2.5 to 3.1 and scales with each floor, reaching a range of 5.4 - 6.7 on Home. Souls dropped from enemies are colored red, and the Urn displays a red graphic on the HUD when active.
Book of Virtues: A wisp spawns for every consecutive second Urn of Souls is fired. The occasional fires shot by the wisps block enemy shots, deal contact damage to enemies, and last for 3 seconds before dissipating. The flames deal 10 damage per tick for the first second they're out, scale down to 5 damage over the next second, and then stay at 5 damage until they dissipate (60-30 damage per second). The damage these fires deal does not increase with BFFS! or scale up on later floors.
Immaculate Heart: Each individual flame has a chance to cause Immaculate Heart to generate an orbiting tear.
Lead Pencil: Every 15 flames shot out of the urn will shoot a barrage of Isaac's tears.
Multidimensional Baby: All flames shot through Multidimensional Baby are doubled, providing a burst of flashing black-and-white tears.