Gammadoodler
Hero
I don't know what to tell you, most of the vertical space in most D&D worlds is not adjacent to cliffs or buildings or whatever (not a scientific observation, but hardly controversial I hope) and I haven't had a DM yet who would allow me to use athletics or acrobatics to climb up...air. There are creatures that can access this vertical space. Most martials are not included on that list of creatures.You invoked This looks like a job for aquaman Not once but twice . The first with a ten minute single target concentration spell. God thing your example ensures that the rogue fighter or whatever could not possibly use athletics or acrobatics to climb instead of burning a third level spell slot. As to the party "needs teleport" the only time the party "needs" teleport is wgen the GM creates a situation where forcing the wizard to consume a seventh level spell to meet some condition. You might as well include when the party neeeds someone to life powerful build+20strenth worth of weight in an antimagic zone as props to the barbarian at this point too. "facing an army" is a meaningless quantum statement void of any detail that would explain how any class is especially relevant to it
Similarly, most D&D worlds are sufficient large that physical distance, obstacles and travel time are barriers to be navigated. Fully equipped, prepared martials do not have the tools to practically navigate those obstacles with comparable speed.
You've proposed a counter in your 20 strength lifting challenge in an anti magic zone. Compare how narrow this circumstance is vs simple going up and down or going far away quickly.
As it relates to the army, I thought it was implicit that AoE damage (which casters get access to, and martials do not..like basically at all)is significantly more effective in that circumstance than single target burst damage (which some martials excel at..but which many casters can do respectably), since there are likely to be multiple targets within an area of effect as armies are traditionally composed of groups of individuals. Please let me know if you require more "meaning" than that (noting that I don't believe I've provided any additional detail here beyond defining words and roughly summarizing generic class capabilities).