Reverberation (Condition)
Reverberation Affected entity has a -1 penalty to Strength, Dexterity, and Constitution 
Saving throws per remaining turn.
When the entity has 4 or more turns of Reverberation, it takes 1~4 Thunder damage and possibly falls Prone. The condition is removed afterward.
Creatures Inmune to 
Thunder damage can't recieve Reverberation.
Sources of Reverberation
Reverberation does apply the stacking penalties to Strength, Dexterity, and Constitution Saving Throws. But the effect at 4 stacks which causes thunder damage and possibly knocks the enemy prone does not work as of Launch Hotfix 4. Stacks of Reverberation can grow up to a maximum of 7 turns and are not consumed when reaching 4, and neither damage nor prone ever happen. The different items that can apply Reverberation do not all work as expected from their description.
Items that Apply Reverberation
- Equipment:
Gloves of Belligerent Skies: When the wielder deals Radiant[[File:{{{2}}} Damage Icon.png|link=Damage Types|x25px|alt=Damage Types|class=bg3wiki-icon ]]{{{2}}}, Lightning[[File:{{{2}}} Damage Icon.png|link=Damage Types|x25px|alt=Damage Types|class=bg3wiki-icon ]]{{{2}}}, or Thunder[[File:{{{2}}} Damage Icon.png|link=Damage Types|x25px|alt=Damage Types|class=bg3wiki-icon ]]{{{2}}} damage, apply 2 turns of Reverberation to the target(s).
Boots of Stormy Clamour: When the wearer inflicts a condition upon a hostile creature, they also inflict 2 turns of Reverberation.
Items that Interact with Reverberation
Ring of Absolute Force: If the wearer bears the Absolute's brand, they deal 1 additional thunder damage. NB : this should work with reverberation, but can't be tested as reverberation doesn't work for now.