Hello, I brought a Lantern Archon into Ravenloft and it was a
horrifying experience.
If I recall correctly, the Ravenloft player's guide book says that bringing fiends into the demiplane is worthy of a DP check, but not summoning celestial?
Indeed:
Using a calling spell to conjure an evil creature requires a powers check.
But calling
any creature is a betrayal of that creature:
When the called creature attempts to leave Ravenloft after completing its task and discovers it cannot, the pact is broken. You lose all control over the creature, which is likely to feel betrayed.
A called creature's behavior once a broken pact frees it from your control depends on the creature's alignment. Evil or neutral creratures might try to destroy you in retaliation.
Lantern Archons are usually more polite about it. But the Lantern Archon Incident mentioned above, about which I'm writing an IC essay, saw a Lantern Archon become corrupted after being separated from its home and friends. Which probably even counts as:
Defilement is the act of causing a sacred place, object or person to lose its holy blessings.
An Unholy act usually worthy of a Powers Check.
As for who knows this?
Spellcasters native to Ravenloft have learned most of the limitations of magic through generations of research. Folklore is likewise filled with warnings against the risks of tampering with the laws of nature, though these superstitions often exaggerate or distort the truth. If a spell effect - such as detecting moral alignment - simply does not function in Ravenloft, most spellcasters believe that the effect is inherently impossible. They may even scoff openly at the thought that such things may be possible in other lands.
From the 2e Campaign Setting:
Summoning creatures from outside Ravenloft is possible. the subjects of these spells are likely to be very unhappy when they learn that they must find their own ways back to their places of origin. Non-evil beings will expect a very good explaination at the least, and evil creatures are likely to attack the priest if given the chance.
I'm with HouseOfLament here. Actually casting that spell is almost always an act of (pretty horrific) evil: you're defiling an angel, either trapping it permanently or summoning it to watch it die. I'm less sold that it should be stricken from the list, both for congruity with the Good Domain outside of Ravenloft, and also to underline the moral dilemma here: the Dark Powers are leaving an option on the table for a Good character to do Evil, for
convenience sake. Use it in front of a DM at your peril, but also: consider that if you're using it to grind dungeons, your character is kind of a monster for doing so.
f a character is able to help others but does not use the power to help that is also an evil action
Ravenloft (ie. the Dark Powers) often doesn't see things that way. Sure, it might also be convenient to
Gutwrench your less experienced dungeon companions so as to more efficiently be able to cleanse the evil from this
pile of treasure den of wickedness, but Ravenloft puts a lot of stock in dentological over consequentialist morality. That's why the consequentialist Halans are TN, not NG. And why casting necromancy spells is
always an evil act in Ravenloft, even for "good" reasons.