Sweet Little Lies

[DM Zarthrax]

So, this world is fairly dimensionally isolated (run when you hear me start a conversation talking about dimensions), and there aren't a lot of obviously magical beings running around...

What about Summon Monster spells? Can you still summon things that (maybe) don't exist in real life?

You can completely summon whatever you normally can with a Summon Monster spell. 

The drawback is when the local no-majs see it, and the various Cults find out that you let it leak.

Now, if you're in the middle of a forest in the middle of nowhere, are fighting a monster that will kill you, and the only way to survive is to summon a T-Rex? Go right ahead. Just be aware of who may be watching this happen, and what happens if word of magic leaks.