Acid damage in D&D 5e represents corrosive effects that eat away at creatures, objects, and environments, and it appears in spells, monster abilities, and environmental hazards. This guide explains how acid damage works in practice, what resistsances and immunities mean at the table, and how to handle acid when it deals damage to characters, monsters, or objects. Because the underlying rules are stable and appear across multiple official sources, these principles remain reliably useful for players and DMs long after individual adventures end.
Core Rules for Acid Damage
Acid damage is one of the core damage types in the Player’s Handbook and the Dungeon Master’s Guide. Whenever a spell, class feature, monster trait, or environmental effect deals acid damage, the game follows the same basic structure as other damage types: a source declares the amount or method, the target’s resistances, immunities, and vulnerabilities apply, and hit points are reduced accordingly.
Objects can take acid damage from spells like burning hands reinterpreted thematically, from monster abilities, or from lingering acid effects in the environment. While there is no dedicated acid subtype on creatures, specific materials or conditions can make certain objects more vulnerable to acid. The rules rely on the DM to interpret whether an effect deals acid damage and how it interacts with the environment, armor, and shields.
Resistances, Immunities, and Vulnerabilities
Resistances reduce damage taken from a source, immunities prevent damage entirely, and vulnerabilities double damage taken. For acid damage, these traits are found in specific monsters, magical items, and temporary conditions, not as a default trait of any broad race or common armor type.
- Resistance to acid damage halves any acid damage a creature takes.
- Immunity to acid damage prevents any acid damage from affecting the creature, though other effects may still impose conditions, such as ongoing damage or inhibition of healing.
- Vulnerability to acid damage doubles any acid damage the creature takes.
Because these traits are creature-specific rather than broadly applied, DMs should consult the stat block or official errata to confirm whether a monster or NPC should be treated as resistant or immune to acid in a given campaign.
Monster Examples: Typical Acid Traits
Some monsters in the official game have notable resistances or immunities to acid, often reflecting their physiology or magical nature. It is important to verify each creature’s stat block, since official publications occasionally update or clarify these traits.
| Creature | Acid Trait | Source |
|---|---|---|
| Black Pudding | Immunity to acid | Monster Manual |
| Adult Black Dragon | Resistance to acid | Monster Manual |
| Gray Ooze | Resistance to acid | Monster Manual |
| Owlbear | No inherent resistance or immunity | Monster Manual |
Spells and Class Features That Deal Acid Damage
A number of spells and class features explicitly deal acid damage, giving characters consistent ways to apply this damage type in combat and exploration. These options scale with character level, and many of them allow you to choose whether a target is caught in the area or struck directly.
- Acid Splash: Cantrip that lets you target a creature within range with a small burst of acid. You can roll multiple attack hits if you use a bonus action to aim at additional targets.
- Burning Hands: Low-level spell that deals fire damage, but some DMs allow a thematic interpretation for acid effects at the table.
- Corrosive Consumption (bTOM-specific homebrew or variant rules): Not part of official 5e rules, so verify with your DM before using.
- Passwall and similar utility spells: Not acid damage, but DMs sometimes allow creative combinations involving material transformation or dissolving surfaces.
Spell Save DC and Attack Rolls
When a spell deals acid damage and requires a saving throw, the DC is calculated using your spellcasting ability modifier and proficiency bonus, just like any other spell. For example, many acid spells use your Spell Save DC, and creatures that succeed often take half damage unless a feature specifies otherwise. If the spell requires an attack roll, resistances and immunities apply after the roll hits, following the standard sequence: attack roll, damage roll, then damage type modifications.
Objects and Acid: Interaction with Armor, Shields, and Items
Objects such as wooden doors, leather armor, and certain containers can be affected by acid, which makes the environment an active part of tactical play. The durability of an object is typically expressed in hit points, and acid damage that reduces an object to 0 hit points causes it to break or dissolve depending on the narrative description.
Armor and shields generally do not grant inherent resistance to acid, but a shield can still be targeted by an effect that requires an attack roll, and the shield’s AC applies normally if the effect strikes it. Magical items can have specific acid resistance or immunity, and those traits are listed on the item’s description in official sources.
Environmental and Tactical Considerations
Acid can appear as a pool on the floor, a spray from a monster’s breath, or a lingering mist that damages characters who move through it. Many published adventure modules include acid as an environmental hazard that deals ongoing damage to creatures at the start of their turn unless they take an action to escape or neutralize it.
Cover such as stone walls can sometimes slow the spread of acid, while wooden or cloth barriers may dissolve more quickly. These decisions are ultimately up to the DM, but the baseline expectation is that acid deals consistent damage and can be mitigated through resistance, immunity, or by ending your turn out of the hazard.
Defensive Options and Counterplay
Characters can protect themselves against acid using a combination of class features, spells, and items. Resistance from a monster, a magic shield, or a temporary barrier can reduce or eliminate acid damage, while spells such as protection from acid provide targeted defense. On the tactical side, ending your turn in acid usually allows you to spend an action to move away, and certain reactions can prevent you from stepping into known hazards.
In long campaigns, tracking resistances and immunities becomes easier when you maintain a shared reference for what each enemy can withstand. Verifying traits from official sources and using consistent rules ensures that players understand when their acid-based options will be effective and when they need to adjust tactics.
Design and Homebrew Guidance
When designing encounters or homebrew content, consider acid damage as a tool for environmental storytelling and tactical pressure. Moderate, reliable acid effects can challenge players who lack resistance, while occasional powerful acid bursts can reward preparation and smart positioning.
If you introduce custom monsters or items with acid traits, document the chosen resistances, immunities, and damage values clearly. Comparing your entries to established examples in the Monster Manual helps keep your creations balanced and recognizable to experienced players.