Wicht
Hero
The whole Demon summoning thing came up because Wicht insisted that you cannot use a lower level spell to cast a higher level spell. That is now proven false.
Eh, not so much.
You can Planar Bind a Glabrezu, yes?
yes
You can get a Wish from that bound Glabrezu, yes?
There is a possibility of getting a wish. Its not a certainty. There are a number of possible reasons the wish might not be granted, according to the rules as written.
Thus, you can cast higher level spells by using lower level ones. End of story.
You did not cast wish. You bargained for wish and paid some sort of heavy price. It is no different than a 1st level character being able to buy a potion of invisibility. The price paid for the potion is not akin to being able to cast it. If you did not pay a price, or if there is going to be no price to be paid in the future, the DM is doing it wrong. Demons are not supposed to be in the wish granting business. They are in the soul harvesting business.
The astral projection "wish exploit" is an attempt to get something for nothing. The summoning a demon to get a wish is an example of buying a wish via a magically created opportunity.
Its an apples and oranges comparison.
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