Hohige
Explorer
The Shadow Sorcerer is susceptible against any area of effect that passes through walls. Umbral Form is defeated by any spell that incapacitates, some of which are low enough level that a 20th level caster can afford to risk wasting them on a held action and some others can pass through walls. The Moon Druid wildshapes repeatedly until the Shadow Sorcerer runs out of resources, and, in Earth elemental form, can both pass through stone and has double damage against walls. If Simulacra are allowed than a Wizard can bring dozens of them. Hiding behind walls will keep the Shadow Sorcerer from being able to counterspell their opponent. Distance advantages are only a huge boon when there is a frontline of allies keeping your enemy from closing that distance and almost no enemy would be fighting them from 620 feet away. One of the few that might is a Warlock with Spell Sniper and Eldritch Spear, so be prepared for 4 d10+5 held Eldritch Blast force damage attacks every time he pops out of cover, from which he has no resistance so don't count on holding concentration.
It's a strong contender, but it being the winner is far from obvious.
What's spell can pass through walls??
Moon druid. Simulacrum's Empowered Insect Plague +20 damage (Radiant Soul)+ Shadow Sorcerer Power Word Kill.
Also, Warlock range is 600 x Sorcerer's 620's that ignores cover and his simulacrum doubles it. Warlock's eldritch blast can't do nothing against Umbral Form inside walls. The Sorcerer can cast Distant Dimention Door for teleporting 1000ft and counterspell the warlock too easily.
Infinite loop? The sorcerer also can do it, but twinned and still coffeelocking. But, It will never come to play.
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