Blight

Level 4 Necromancy spell available to Druids, Sorcerers, Warlocks, and Wizards. 8d8 Necrotic to a single target, Constitution save for half, no effect on undead or constructs. It is a big single-target hit, and it does something horrible to plants.

Spell description: Deal 8d8 Necrotic damage to a target. Plants take maximum damage and have Disadvantage on the Saving Throw. No effect on undead and constructs.

Spell properties

• Damage: 8d8 Necrotic
• Damage type: Necrotic
• Range: 9m (30ft)
• Save: CON save (half damage on success)
• Conditions applied: Plants take maximum damage (64) and roll the Saving Throw with Disadvantage. No effect on undead or constructs.
• Cost: Action + Spell Slot
• Recharge: Per action

Spell upcasting

Deals an extra 1d8 Necrotic damage for each spell slot level above the 4th.

How to obtain Blight

• Druid, Sorcerer, Warlock, Wizard at Class level 7
• Circle of the Spores Druids (Circle spell) and Death Domain Clerics (Domain spell) at Class level 7
• Bard via Magical Secrets at Class level 10

Source items: Woe, Scroll of Blight

When to cast Blight

Blight is the single-target damage option at this level for casters who do not have a better one. 8d8 averages 36, and Constitution is a save most monsters are good at, so expect half damage more often than you would like.

Where it shines is against plants. They take the maximum 64 and roll the save with Disadvantage. Wood woads, blights, and the myconid-adjacent things in the Underdark all count. Act Two plants resist Necrotic, which cuts it back to 32, but that is still a lot for one cast.

Skip it against undead and constructs entirely, it does nothing to them. That rules out a lot of Act Two and Act Three enemies, so check the target type before you commit the slot.

For a Sorcerer or Wizard with Fireball available, Fireball upcast to Level 4 usually does more total damage. Blight earns its slot when you need to hit one thing hard without catching your own melee in the blast.