Was sitting in one of the crypts behind the chapel in the outskirts. Tried to unsummon my familiar, which was outside of the crypt, and it was killed when i did so. The combat log showed no damage to the beast; and i found it's corpse where i unsummoned it. Unsure if range or time was the factor; because i have unsummoned it from another cell before with no issues. Will test some more and update this if i find anything concrete.