Blight — Complete D&D 5e Spell Guide

Table of Contents

• •Quick Answer
• •Overview
• •Stat Block
• •When NOT to Use
• •Comparisons
• •Spell Slot Efficiency
• •Pro Tips
• •Common Mistakes
• •Usage Tips
• •Synergies
• •FAQ

Overview

Listen up, first-time caster buddy—Blight is a solid but niche 4th-level necromancy single-target zapper that dumps 8d8 necrotic damage (average 36, max 64) on a CON save within 30 feet. Fail: full hit; success: half (18 avg). Zero effect on undead or constructs, which tanks its value in crypt crawls. But here's the kicker: plant creatures save with disadvantage and take max damage (64 full, 32 half), and non-creature plants like trees just wither instantly—no save. Upcast adds 1d8 per slot (9d8 at 5th = avg 40.5).

Spell slot economy? Situational at best. That 4th slot could upcast Fireball for 10d6 (35 avg) to a 20-foot radius, hitting 4+ foes reliably. Blight's opportunity cost is huge unless you're in the Underdark facing blights (twig: insta-kill; needle HP27 vs 64 max; blight HP66 vs 64—still chunks it). Veterans love it for druids in nature-gone-wrong campaigns, but wizards/warlocks? Prep it rarely. Common misplay: blasting humanoids expecting a nuke—they often resist necrotic (15-20% monsters do) or save to peanuts. Don't cast when foes cluster (AoE wins), undead lurk, or you need control (Polymorph, Summon Elemental).

Head-to-head: Vs Ice Storm (same level AoE bludgeon), Blight wins solo plant bosses; Ice Storm owns mob control with difficult terrain. Lower alt: Vampiric Touch (3rd, 5d6 sustained melee necro)—safer slot but touch range sucks. Builds to Circle of Death (6th AoE necro). Pro tip: Pair with Hex (bladesinger warlock adds 4-6 dmg/turn) or Contagion (poisoned disadv on CON). Trap pick for generalists—excellent for Circle of Spores druids, mediocre elsewhere.

Stat Block

When NOT to Use This

• •Enemy groups of 3+ (Fireball upcast averages 140 total HP denied vs Blight's 36).
• •Undead or construct bosses present (0 dmg wastes 4th slot).
• •Need battlefield control (Ice Storm terrain > Blight delete).
• •Foes have Legendary Resistance (burns your limited MR uses).

Spell Slot Efficiency

When worth the slot: Plant enemies confirmed (Underdark, feywild); solo bosses with necro vulnerability.

When NOT worth the slot: Crowds (AoE needed); undead/construct tables; low slots (<4th available).

Pro Tips (Veteran Secrets)

Tip #1: Always pre-scout with familiar or Detect Magic for plant-heavy lairs—Underdark modules like Out of the Abyss are Blight heaven.

Why veterans know this: 15+ years: Blights appear in 20% Underdark encounters; twig swarms die free.

This avoids the mistake of: Wasted slots on generic foes—now you ID targets fast.

Tip #2: Upcast only on confirmed plants; 6th slot (12d8=72 max) deletes vine blights (HP 66).

Why veterans know this: Max damage clause overlooked in 90% tables—turns trash spell to MVP.

This avoids the mistake of: Assuming average rolls; RAW max seals kills.

Tip #3: Druids: Prep over Conjure Minor Elementals if intel hints plants.

Why veterans know this: Slot competition fierce; Blight frees action economy vs summons.

This avoids the mistake of: Overcommitting summons that fizzle.

Tip #4: Warlock: Hex first, then Blight—adds 3.5 necro if multi-hit follow-up.

Why veterans know this: Pact Magic synergy maximizes short-rest recovery.

This avoids the mistake of: Forgetting Hex boosts all necro sources.

Common Mistakes to Avoid

Casting Blight on first tough-looking humanoid.

Why it's bad: Necrotic resisted by fiends/demons/undead-adjacent (20% monsters); half-save yields 18 avg—worse than 3rd-level Guiding Bolt.

Do this instead: Probe with lower slot (Chromatic Orb) or ask DM for type; save for plants/bosses.

Upcasting to 6th+ routinely for 'more damage.'

Why it's bad: 11d8 avg 49.5 single-target loses to Synaptic Static (11d6=38 psychic AoE + debuff); slots better for summons.

Do this instead: Upcast only post-scry/legend lore confirming plant—else Fireball.

Ignoring plant clause on creature plants like shambling mounds.

Why it's bad: Standard save assumes avg 36; disadvantage + max jumps to 64 guaranteed on fail—double value.

Do this instead: ID via Nature check DC10-15; target sovereigns first.

Forgetting no effect on warforged/animated armor.

Why it's bad: Wastes precious 4th slot in steampunk/construct campaigns.

Do this instead: Passive Perception lore checks; prep Disintegrate instead.

Usage Tips

• •Prioritize plant creatures in groups like myconid colonies—64 max damage on a needle blight (HP 27) oneshots it, preventing spore clouds that poison your party. Follow up with area control like Entangle to lock down survivors. This turns a swarm into cleanup.
• •Use on high-HP bosses after action denial: Slow (3rd) or Hypnotic Pattern drops their save odds, pushing Blight's 36 avg to reliable burst. At 30ft range, position safely behind tanks. Upcast to 5th only if confirmed plant (9d8=72 max obliterates).
• •In exploration, wither vines/trees blocking paths silently—instantaneous and no combat needed. Combo with Pass Without Trace for stealthy clears. Avoid open casts; V/S components risk Counterspell.
• •For warlocks, twin it? No, single target only—not Twinned Spell eligible. Save Pact slots for this in boss fights over Eldritch Blast if necro vulnerable.

Rules Notes

• •RAW: Nonmagical plants (trees, shrubs) die instantly without save; magical plants or plant creatures (blights, myconids) get disadvantage + max damage on failed save.
• •RAI vs RAW dispute: Blights are plant creatures, so max damage applies—withering a tree won't alert guards if stealthy.
• •No effect on undead/constructs is absolute; even if flavored as draining 'vitality,' mechanics override.

Synergies

• •Hex (1st, Warlock): +1d6 necrotic per beam if blasting after, but mainly boosts future necro; stacks with Blight's burst for 40+ total.
• •Contagion (5th): Poisoned condition gives disadvantage on CON saves, turning Blight into near-guaranteed max damage even on non-plants.
• •Sickening Radiance (4th): Exhaustion worsens saves; pre-cast to soften targets before Blight finisher, though concentration competes.

Anti-Patterns

• •Never default to humanoids—necrotic resistance on bosses like vampires halves value to Fireball levels without AoE.
• •Skip upcasting routinely; 5th slot Blight (9d8 avg 40.5) loses to 5th Fireball (11d6=38.5 AoE).
• •Don't burn in undead tombs—100% miss wastes the slot when Turn Undead or Spirit Guardians shreds them.

Tactical Modules

• •Underdark Plant Purge — When to use: Myconid groves or blight ambushes (CR1-5 plants common at levels 5-10). Synergy: Entangle or Spike Growth pins them first; Blight max-damages leaders, collapsing the fight
• •Boss Vitality Drain — When to use: Solo high-HP living bosses (ogre boss HP 80+) after debuff. Synergy: Slow or Tasha's Hideous Laughter for advantage/disadv; upcast Blight chunks 50% HP
• •Hazard Creation — When to use: Forests/jungles with enemy cover or barricades. Synergy: Wither trees to drop crushing weight (DM improv 4d10 bludg); pairs with Flaming Sphere for fire spread

Countermeasures

• •Threat: Undead horde (skeletons, zombies) — Response: Skip Blight entirely—switch to upcast Fireball or Spirit Guardians. Fallback: Position for Channel Divinity: Turn Undead if cleric ally
• •Threat: Flying/AC high construct foes — Response: Blight ineffective; pivot to Banishment or Dispel Magic on summons. Fallback: Hold Monster if humanoid controller present
• •Threat: High CON save elites (hill giant avg +3 CON) — Response: Pre-debuff with Ray of Sickness (poison disadv) or Hypnotic Pattern. Fallback: Fall back to reliable single-target like Vitriolic Sphere

Frequently Asked Questions

is blight good 5e

Situational in 5e—excellent vs plants (max 64-72 dmg with disadv), poor vs undead/constructs or groups. Prep for druids in Underdark; skip for wizards. Better than Ice Storm for single bosses.

blight vs fireball 5e

Fireball (3rd/4th upcast) wins AoE (35-70 dmg to multiple); Blight better single plant/boss (36-72 necro). Use Blight for confirmed plants, Fireball always.

does blight work on undead 5e

No—Blight has no effect on undead or constructs per RAW. Switch to Fireball or Harm. Great vs blights instead.

blight spell plants 5e

Plant creatures: CON save with disadvantage + max damage (64 at 4th). Non-creature plants (trees): instant death. Deletes twig/needle blights effortlessly.

best classes for blight 5e

Druids (Circle of Spores synergy) and Warlocks (Hex boost) get most value. Wizards situational. Sorcs rarely due to limited slots.

can sorcerers twin blight 5e

No—Blight targets one creature, ineligible for Twinned Spell (requires single creature both benefit/harmed). Use Quickened Fireball instead.

blight upcast worth it 5e

Only vs plants (6th slot=72 max obliterates HP66 blights). Skip vs humanoids—Fireball upcast better AoE. Niche yes.

does blight work underwater 5e

Yes—V/S components, no fire/water issues; necrotic energy unaffected. Max dmg still applies to kelp plants.

Citations: api:spells/blight

Includes SRD content per CC BY 4.0. Source: dnd5eapi.co.