People want details. That's just a fact of the modern world. It's not enough to tell them that the 20th level half-dragon Mage Lord you spent hours crafting to tackle the Player Characters' party can levitate and is immune to corporeal damage; they want to know why. They have to question, and ask, and prod and poke and pick apart everything you built.

So let Arcturius, the undead knight, sum up your every answer in two simple words; "MAGIC, BITCH!". Next time those nosey players ask why something happened or someone asks why your OC can control fire or summon a ghostly harem, just direct their gaze to your chest and let the snarky skeleton do the talking for you.