Adamantine Armor (Plate)
D&D 5e · 2024·Heavy armor·Uncommon·No attunement
Your Dexterity modifier does not change this Armor Class, up or down.
Armor Class calculator
- Category
- Heavy armor
- Dex bonus
- None
- Stealth
- Disadvantage
- Strength
- Str 15 (else −10 ft. Speed)
- Weight
- 65 lb
- Don / doff
- 10 minutes / 5 minutes
- Rarity
- Uncommon
- Price
- Not specified
Magic: Critical Hits against you become normal hits while you wear this armor. Adamantine adds no bonus to AC.
Calculator assumptions & rules
Uses this entry’s AC formula, Dexterity cap and listed shield bonus. Magic AC already included in the entry is counted once. Features, spells, alternative AC formulas and exceptions to Strength penalties are excluded. You still need the required armor training or proficiency.
Changing calculator inputs does not change the item’s rules or create a new page URL.
Adamantine Armor AC by armor type
Choose a published armor variant to see its full statistics and calculator for this edition.
| Armor | Armor Class | Stealth |
|---|---|---|
| Chain Shirt | 13 + Dex (max 2) | — |
| Scale Mail | 14 + Dex (max 2) | Disadvantage |
| Breastplate | 14 + Dex (max 2) | — |
| Half Plate | 15 + Dex (max 2) | Disadvantage |
| Ring Mail | 14 | Disadvantage |
| Chain Mail | 16 | Disadvantage |
| Splint | 17 | Disadvantage |
| Plate | 18 | Disadvantage |
What Adamantine Armor does
- AC 18 does not improve with Dexterity. Compare armor options using your actual Dexterity modifier rather than their base AC alone.
- It imposes Disadvantage on Stealth checks; consider that cost if the group relies on sneaking.
- Strength 15 avoids this armor’s listed Speed penalty. The calculator flags the penalty when your Strength is lower.
- Critical-hit protection changes incoming critical hits to normal hits; it does not add AC or prevent the ordinary damage from a hit.
This suit of armor is reinforced with adamantine, one of the hardest substances in existence. While you're wearing it, any Critical Hit against you becomes a normal hit. This is the Plate Armor variant.
Full item details & properties
Magic properties
- Activation
- Wear this armor.
- Consumable
- No
- Critical-hit protection
- Critical Hits against you become normal hits while wearing this armor.
- Conditions & limits
- While wearing this armor, Critical Hits against you become normal hits. The material grants no additional Armor Class bonus; the normal armor’s Strength and Stealth rules still apply.
Armor details
- Armor Class
- 18
- Category
- Heavy
- Dexterity modifier
- Not added
- Strength to avoid Speed penalty
- 15
- Stealth disadvantage
- Yes
- Don
- 10 minutes
- Doff
- 5 minutes
Tags & related references
Compare alternatives
Same edition, using your calculator inputs above. Special properties and character features can change the choice.
Same base armor; compare magical benefits
Armor of InvulnerabilityAC 1818 AC · Stealth DisadvantageNot specified · 65 lbSame base armor; compare magical benefits
Armor of Resistance (Plate)AC 1818 AC · Stealth DisadvantageNot specified · 65 lbSame base armor; compare magical benefits
Armor of Vulnerability (Plate Armor)AC 1818 AC · Stealth DisadvantageNot specified · 65 lbSame base armor; compare magical benefits
Adamantine Armor FAQ
What Armor Class does Adamantine Armor (Plate) give?
It starts at AC 18. Dexterity does not change its AC, whether your modifier is positive or negative.
Does Adamantine Armor require attunement?
No. This entry does not require attunement; follow its activation and use rules.
Does Adamantine Armor prevent all damage from a critical hit?
No. The Critical Hit becomes a normal hit. The attack still deals its normal damage; this property does not prevent the hit or add Armor Class.
What if my Strength is below 15?
The armor lists a 10 ft. Speed penalty below Strength 15. The calculator flags it; character features may provide exceptions.
Is the listed price a guaranteed purchase price?
The source does not specify a price for this entry. Ask your GM about availability and cost.