I was just reviewing my Q&A about the effect of a negative Constitution modifier, and that is limited to the effects on the PC stats and abilities (specifically HP, fatigue, etc).

I remembered that Barbarians also use Con for the their Unarmored Defense ability, and (while it is a UA, so probably not as important, but still note-worthy in this regard) The Giant Soul Sorcerous Origin relies on Con as well.

Are there any Magic Items that would be affected by a negative Constitution Modifier?


There are many items that have various effects tied to your constitution modifier. I have chosen only to list those items for which a negative constitution modifier creates a serious malfunction.

Ring of Temporal Salvation

If you die while wearing this gray crystal ring, you vanish and reappear in an unoccupied space within 5 feet of the space you left (or the nearest unoccupied space). You have a number of hit points equal to 3d6 + your Constitution modifier. If your hit point maximum is lower than the number of hit points you regain, your hit point maximum rises to a similar amount. If you have any levels of exhaustion, reduce your level of exhaustion by 1. Once the ring is used, it turns to dust and is destroyed.

A negative constitution modifier can nullify the effects of this magic item entirely. With a modifier of -3 or lower, rolling three 1s on the 3d6 means you reappear unconscious.

Soul Coin

A non-evil creature can carry a number of soul coins equal to or less than its Constitution modifier without penalty. A non-evil creature carrying a number of soul coins greater than its Constitution modifier has disadvantage on its attack rolls, ability checks, and saving throws.

With a constitution modifier less than or equal to 0, a single soul coin imposes disadvantage on all attack rolls, ability checks, and saving throws.

  • \$\begingroup\$ While a negative Con mod is certainly disadvantageous when carrying Soul Coins, in that carrying even one imposes a penalty, I would not say it is a 'serious malfunction'. Indeed, hindering non-evil creatures seems like one of the functions of a soul coin. This is in contrast to the ring of temporal salvation where, as you point out, a negative Con mod can prevent the ring from doing what it is designed to do. Both items are certainly responses to the OP's search for items that "would be affected by a" negative Con mod. \$\endgroup\$ – Kirt Nov 18 '20 at 16:42
  • \$\begingroup\$ I guess for the soul coins it's a matter of perspective. Disadvantage every time you role the d20 feels like a serious malfunction to me, at least from the perspective of the good character. \$\endgroup\$ – Thomas Markov Nov 18 '20 at 16:44

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