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How do you have the dragon act so that is a real challenge to the PCs?
Ho Ho! Go look up "ancient copper dragon" for starters. Here is a CR17 that can cast (at will): Grease, Hideous Laughter, Stone Shape, Transmute Rock to Mud, and Wall of Stone. ...What do you think an encounter with one would be like? It would be like a 3D funhouse of terrorlaughs. It's a dungeon designed by M.C. Escher and run by the Time Bandits. It's doubtful any of them would ever actually FIND the copper dragon unless he wanted them to. Never mind WHAT the party is doing there in the first place.
At that level, you gotta go beyond just the list of stats and putting them in a 30x30 room. Go down the monster's list of feats and abilities and put together a story of how they got to be so old and powerful. Consider all of the friends and alliances they've made in their lives and the general ecology of how they live. You'll come up with some epic encounters to keep high level characters guessing.
As a fighter I feel useless unless there is a combat going on.
Just like a high level dragon, how did a fighter get so experienced? Does he live in a vacuum? What about all of the enemies he's made along the way? What about all of the friends who want a powerful martial to come help them out? (think of all those westerns where they want to recruit the hero). Remember a martial is what the people SEE when they picture "adventurer" or "hero". He should be casting a long shadow.
What do you do to challenge the wizard?
Make the world a deadly place for someone with less than 100 hit points. Make it a dangerous place for someone with an AC of only around 20 or so. Adjudicate EVERY SINGLE SPELL as it's written in the book. There are actually a surprising number of limitations.
Then...make him work for it. Creating an adventure? Surprise! It takes place in a cavern system that is incredibly hot and full of smoke. (Gonna need that Environment spell). Find the bad guy's castle? Surprise! It doesn't have any doors or windows! (Gonna need a transmute or something). It's up on that floating island in the sky? Surprise! How you getting up there? Surprise! It's guarded by invisible redcaps! Now the spellcaster has to somehow make all those redcaps visible for the party...You get the idea. If he thinks he's so great, make him work for it.
...and then have him roll a save for his spellbook the next time they cross a river. He'll start feeling vulnerable.