Last Updated on January 22, 2023
Welcome to our magic item gear guide to the Armor of Invulnerability. In this guide, we’ll outline how this legendary magical armor works in Dungeons & Dragons 5e and which character classes can make the best use of this item as well as answer some frequently asked questions.
Armor of Invulnerability
Armor (plate), legendary (requires attunement)
Wearing this suit of magical full plate armor, the wearer is resistant to all nonmagical damage. As an action, the wearer can also activate the armor, making themself immune to nonmagical damage for 10 minutes or until the armor is removed. This special action can be used only once per day and resets at the following dawn.
Plate consists of shaped, interlocking metal plates to cover the entire body. A suit of plate includes gauntlets, heavy leather boots, a visored helmet, and thick layers of padding underneath the armor. Buckles and straps distribute the weight over the body.
What Is the Armor of Invulnerability?
The Armor of Invulnerability is a legendary suit of magical armor that not only grants the wearer resistance to all forms of nonmagical damage but once per day can grant total immunity to nonmagical damage for 10 minutes.
Who Can Wear Armor of Invulnerability?
The Armor of Invulnerability does not restrict the character classes that can attune to it, which means anyone can spend an hour-long short rest learning how the armor works, after which they’ll receive the damage resistance bonus while wearing it and be able to trigger damage immunity once per day.
However, the Armor of Invulnerability is still a suit of heavy armor, and therefore, only a character with proficiency in Heavy Armor can wear it without incurring the following penalties.
If you wear armor that you lack Proficiency with, you have disadvantage on any ability check, saving throw, or Attack roll that involves Strength or Dexterity, and you can’t cast Spells.
Only the Fighter and Paladin classes are proficient in Heavy Armor as part of their class. The Cleric class doesn’t get heavy armor proficiency as standard unless you choose either the War, Tempest, Nature, Order, or Life Divine Domains, all of which let you wear heavy armor.
Summarily, the best ways to become proficient in Heavy Armor include…
- Create a character who is a Fighter or Paladin (you can’t multiclass into these classes later and still get the proficiency).
- Start or multiclass as a Forge, Tempest, War, Nature, Order, or Life Domain Cleric.
- Take the Heavily Armored feat (which requires you to have Medium Armor proficiency already — which you can get with the Moderately Armored feat).
- Cast Tenser’s Transformation on yourself
The Armor of Invulnerability’s rarity makes it highly unlikely that a character can expect to acquire a suit at lower levels, and setting out to obtain this magic item could even form the focal point of an entire adventure or campaign arc.
How Good Is the Armor of Invulnerability?
This combination of an always-on buff (which is immensely powerful in and of itself) with a powerful temporary effect with a pretty great duration makes the Armor of Invulnerability one of the most effective defensive magic items in all of D&D 5e.
Nonmagical damage doesn’t just mean bludgeoning, piercing, and slashing damage from attacks made with nonmagical weapons; any attack that isn’t explicitly magical — like an Ancient Red Dragon’s claws and breath weapon, for example — is going to have its damage halved or, if you’ve activated your armor, reduced to 0.
Obviously, powerful enemies wielding weapons — not to mention other monsters like Oni with magical attacks — are going to get you like normal, but wearing this armor and activating its special ability virtually guarantees that you can tear through huge hoards of creatures and low-CR enemies with ease and at little risk to yourself.
Frequently Asked Questions
Can I Cast Spells While Wearing Armor of Invulnerability?
Yes. As long as you are proficient with Heavy Armor and are capable of casting spells already, you can cast spells while wearing the Armor of Invulnerability.
How Much Does Armor of Invulnerability Cost?
As a legendary magic item, Armor of Invulnerability could cost anything over 50,001 gold pieces, with our suggested price being around 150,000 gp. That’s assuming you can find someone willing to sell a set, of course.
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I played my first tabletop RPG (Pathfinder 1e, specifically) in college. I rocked up late to the first session with an unread rulebook and a human bard called Nick Jugger. It was a rocky start but I had a blast and now, the better part of a decade later, I play, write, and write about tabletop RPGs (mostly 5e, but also PBtA, Forged in the Dark and OSR) games for a living, which is wild.