So was looking to start a planescape game using the fifth edition ruleset and while remaining true to the spirit of the 5e rules run a game in the planescape universe. I was debating on how much of the old finicky magic rules should i keep? The inner planes seem pretty basic but the outer planes had that massive magic consulting chart.
Also how does the new 5th edition cosmology effect those weird magic rules. Positive and negative energy planes have moved out of the inner planes, the elemental chaos is back, im keeping outlands even though it isnt listed and both the feywild and shadowfel have returned. Should they be considered part of the prime worlds? A little bit of brainstorming could suggest positive and negative energy planes being part of the third transitive plane.