This cursed ring typically radiates another dweomer to disguise its baneful nature. The possible secondary powers are:

The secondary power works normally, except when the wearer is under stress—combat, stealth, delicate activity—at which time the clumsiness dweomer takes effect. 

Dexterity is lowered to half normal, rounded down. 

Chances for stealth and precise actions are also lowered by one-half, rounded down. 

Any attempt at spell casting that requires the handling of a material component or the accomplishment of a somatic component will only succeed if the wearer makes a saving throw versus spell; otherwise, the spell is botched and annulled.

The ring can only be taken off by a successfully cast dispel magic spell (vs. 12th-level magic). 

Success destroys both the primary and secondary dweomer of the ring.