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Say a full spellcaster is fighting an enemy that has cast an antimagic field on themselves, and due to either the enemy's high Con saves, the low damage output of their martial allies, or both, expects that the antimagic field is not going to go down any time soon.

What spells or types of spells can this caster usefully cast in a combat against an enemy with an antimagic field up?

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    \$\begingroup\$ "Usefully cast" is vague. You've answered your own question so obviously you got the result you intend... but if you were looking for a specific type of spell (direct damage for example) then the asked question is too broad. \$\endgroup\$ – Guy Jul 27 '18 at 21:44
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Spells which keep them/allies out of range, if the enemy is dangerous in melee

Mobility via teleportation (Misty Step, Dimension Door, Teleport) or increased speed (Haste, Fly, Investiture of Wind) can keep them out of reach of the enemy, if it's strong in melee.

Spells which protect them/allies from ranged attacks, if the enemy is dangerous at range

Some spells can make them or their allies harder to hit with ranged weapon attacks (Warding Wind, Investiture of Wind, Haste).

Others can provide total cover against ranged attacks (Wall of Stone, Wall of Force).

Spells which heal themself/allies fighting the enemy

Healing spells or spells which remove/prevent debilitating conditions will keep their martial allies in the fight. (e.g. Heal, Greater Restoration, Dispel Evil and Good)

Spells which provide powerful nonmagical attacks at range

Shapechange or True Polymorph can allow the spellcaster to transform themself into a creature with strong non-magical ranged attacks, such as a Giant (rocks) or a Dragon (breath).

Situationally, Control Water could allow you to try to drown the enemy by causing water to flow outside the area of the spell.

Necromancy spells (watch out for uncontrolled zombies)

Undead that the spellcaster has raised with spells such as Animate Dead or Create Undead will not become inanimate in the Antimagic Field - but the spellcaster's control over them will lapse. Given that the undead will at that point be right next to the enemy, that's probably not all that bad.

Trap them in a Prismatic Wall

Prismatic Wall is explicitly immune to Antimagic Field, and can be shaped to contain such an enemy. Since they've got an Antimagic Field up, they must drop it before they can cast any teleportation spells to escape this trap.

Wish the Antimagic away

The only spell which is capable of directly dispelling the Antimagic Field is Wish. Speaking as a DM, "Beat this specialised level 8 spell" is probably not the level of power at which I would start to bring in unintended consequences of the Wish. This does risk a 33% chance to never be able to cast Wish again, so it is a steep cost.

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  • \$\begingroup\$ Levitate (and drop on target) and probably catapult might also be useful spells that would still work if cast from outside. You might also be able to throw a shrunken boulder as it would unshrink once inside the sphere. \$\endgroup\$ – Nick Brown Jul 28 '18 at 15:15
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They can use an Artifact. From the Antimagic Field description, it doesn't suppress magical effects created by an artifact or a deity.

And since Artifacts are very special, they can do anything that the DM decided they should do. Such as cancelling any spell. Or it could cast Sleep or Power Word Stun, force everyone that looks at it to dance until they die, or anything at all that would interrupt concentration.

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