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.
Each charge is equivalent to 15 flames over half a second.
On use, emits a stream of blue flames in whichever direction Isaac is facing. Each flame deals 1.5 - 2.1 damage per tick, depending on how far it's traveled, for 22.5-31.5 damage per second. Multiple flames can damage the same enemy simultaneously.
Isaac is also pushed backwards slightly while using it.
Can be fired diagonally.
With each floor damage increases by 0.3 damage per tick.
The fire destroys enemy projectiles, poop, and other fires, but bounces off rocks.
Dogma does not provide any souls when transitioning from its first phase to its second.
On PC, it is possible to control Urn of Souls with the mouse for precise aiming. On Windows, go to C:/Users/[username]/Documents/My Games/The Binding Of Isaac [Rebirth/Afterbirth/Afterbirth+/Repentance]/ and in the options.ini file, change the line that says MouseControl=0 to MouseControl=1.
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.