Contagion — 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

Contagion is a 5th-level necromancy spell available to clerics and druids that delivers a touch-based disease debuff. You choose one of six diseases, but it only fully activates after the target fails three CON saves at end of their turns—successes on three ends it early. Effects range from blinds (Blinding Sickness) to stun-on-damage (Slimy Doom), lasting 7 days without concentration. As a veteran, I rate this Poor overall: the unreliable ramp-up (averaging 3 rounds minimum, often more) wastes a precious 5th slot when faster, surer debuffs exist. It's a trap for new casters dreaming of perma-debuffs, but shines rarely against low-CON solo threats.

Stat Block

When NOT to Use This

• •Against flying/ranged enemies who dodge touch easily.
• •In parties without consistent follow-up damage for Slimy Doom.
• •Vs groups—single-target wastes vs Cone of Cold's multi-hit.

Spell Slot Efficiency

When worth the slot: Niche: low-CON solo threats with no healers, post-activation 7-day debilitation.

When NOT worth the slot: Standard combats with CON+5 foes or any AoE need.

Pro Tips (Veteran Secrets)

Tip #1: Always pre-select Slimy Doom—its stun proc averages 50%+ lockdown post-activation vs others' mere disadvantages.

Why veterans know this: Damage triggers are inevitable in combat; others require specific ability reliance, which bosses adapt around.

This avoids the mistake of: Newbies pick Blinding Sickness for 'blinded,' ignoring most foes' blindsight or legendary actions.

Tip #2: Upcast only if desperate; no scaling means 6th+ slots are pure waste vs Animate Objects or Wall of Stone.

Why veterans know this: 5th slots are peak efficiency—Contagion's flat power doesn't justify higher.

This avoids the mistake of: Players upcast thinking more diseases, but it's single-target single-disease only.

Tip #3: Roleplay the incubation: describe symptoms narratively to sell the permanence outside combat.

Why veterans know this: 7-day duration enables downtime hooks like quarantines, turning a mediocre spell into plot fuel.

This avoids the mistake of: Casting then ignoring RP potential, treating it as Fireball-lite.

Common Mistakes to Avoid

Casting on every boss expecting instant effects.

Why it's bad: 3 fails take ~3-6 rounds (DC15 avg 45% fail rate), letting them full-action you to death.

Do this instead: Scout CON proficiencies pre-fight; reserve for minions or NPCs.

Choosing wrong disease without scouting ability reliance.

Why it's bad: Flesh Rot's 'all damage vuln' tempts, but CHA checks rarely matter on fighters.

Do this instead: Ask 'what's the boss's primary stat?' then match (DEX for Seizure).

Forgetting disease immunity on undead/elementals.

Why it's bad: Spell fizzles completely, burning slot for nothing.

Do this instead: Detect undead first or confirm via Knowledge checks.

Usage Tips

• •Prioritize Slimy Doom against melee bosses: stun-on-damage chains with party hits, potentially locking them out of turns indefinitely once active.
• •Use touch delivery via grapple or prone foes to land the initial melee spell attack safely—pair with Hold Person for auto-hit.
• •Track saves meticulously; announce '2/3 fails' to pressure DM into suboptimal enemy plays, but expect Remove Disease counters from minions.

Rules Notes

• •Induces a 'natural disease,' so Lesser Restoration, Remove Curse, or similar disease-curing effects end it immediately, even pre-activation.
• •No initial effect on hit—purely sets up the save sequence; diseases don't stack or interact uniquely beyond their text.
• •Mindfire mimics Confusion only in combat, not full spell duration or out-of-combat effects (RAW).

Synergies

• •Shillelagh (Druid) extends touch range via melee weapon, turning Wild Shape into a delivery beast.
• •Spirit Guardians (Cleric) softens up the target first, burning their HP to trigger Slimy Doom stuns faster.
• •Greater Invisibility hides your approach for safe touch in crowded fights.

Anti-Patterns

• •Avoid in AoE-heavy fights; single-target touch leaves you exposed without upcasting utility.
• •Don't pick vs undead/constructs—immune to disease (PHB p.291), wasting the slot outright.
• •Skip Flesh Rot expecting 'vulnerability to all damage' to dominate; the 3-fail delay lets foes kill you first.

Tactical Modules

• •Slimy Doom Controller — When to use: Solo boss with low CON (+0 to +3) and party DPS ready to pile on.. Synergy: Every damage instance stuns until end of their next turn, synergizing with multi-attackers like fighters for turn denial.
• •Mindfire Chaos — When to use: Against INT-based casters in prolonged fights where Confusion wastes their actions.. Synergy: Combines with Slow or Hypnotic Pattern to multiply confusion effects, crippling spell selection.
• •Filth Fever Melee Shutdown — When to use: Barbarian-style warriors relying on STR attacks/checks in grapples.. Synergy: Follow with Entangle or Spike Growth to prevent escapes, amplifying disadvantage.

Countermeasures

• •Threat: High-CON target (ogre+ or legendaries with advantage) — Response: Abort and pivot to Hold Monster for guaranteed paralysis.. Fallback: Dismiss and recast lower-level debuff like Slow.
• •Threat: Healer minions with Lesser Restoration — Response: Target healer first with a quickened Guiding Bolt, then apply.. Fallback: Switch to non-disease debuff like Banishment.
• •Threat: Ranged/mobile enemy evading touch — Response: Use Faerie Fire or Faery Fire to grant advantage on attack roll.. Fallback: Fall back to Insect Plague for safe AoE.

Frequently Asked Questions

is contagion good 5e

No, Contagion is Poor for most tables—3-fail activation is too unreliable for a 5th-level slot. Use only on low-CON bosses with Slimy Doom; otherwise pick Hold Monster or Synaptic Static.

contagion vs bestow curse 5e

Bestow Curse (3rd level) is vastly superior: instant effect, concentration for flexibility, customizable curses. Contagion's long-term diseases rarely pay off due to cure spells.

can you twin contagion 5e

No, melee spell attack prevents Twinned Spell (Sorcerer)—only single target. Use Quickened for double actions instead.

does contagion work on undead 5e

No, undead are immune to disease (MM p.6). Same for constructs; check immunities first.

best disease contagion 5e

Slimy Doom: stun on any damage is brutal post-activation. Avoid Flesh Rot—vuln rarely triggers enough.

contagion worth preparing druid 5e

Rarely; prepare Insect Plague or Conjure Volley instead. Situational for Wild Shape delivery on solo hunts.

how long for contagion to activate 5e

After 3 failed CON saves (end of target's turns); averages 4-7 rounds at DC17 vs +5 save.

contagion underwater 5e

Yes, touch spell unaffected by water; diseases apply normally.

Citations: api:spells/contagion

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