Elysium

'''Question for you 'Fro, celestial jails. We have Elysium and its Prisoner, there appears to be some jail on Celestia that gets used for souls and possibly other. What's the general outlook in your perspective on the Celestial predisposition on imprisoning people and/or souls. Any additional Canon you recall offhand?'''

Celestials are willing to imprison transgressors in the hope of rehabilitation, although there are many who believe in paying evil unto evil (as it were). Souls are a much sketchier topic; generally speaking, celestials are extremely opposed to the imprisonment of the soul. Other canon... none offhand, no.