Again. Regarding this
This part of rulebook is mentioned:
After announcing an action from an ability on a Strategy or other card in a player’s hand, the card in question is placed in a special temporary area, face-up but out of play. [...] If the card discards itself from the hand as part of its ability, this discard is done from the resolution area.
However:
Below any traits, there may be one or more abilities: blocks of text that describe actions that players can take at certain points in the game. An ability starts with one or more of the boldface terms Battle:, Dynasty:, Limited:, Open:, Interrupt: or Engage:. This term, the designator, also applies to the action taken from the ability and tells when in the game it can be taken.
Clearly defines an action.
Rings have "discard this Ring from your hand" written as a trait, not as an ability, so how does exacly "If the card discards itself from the hand as part of its ability, this discard is done from the resolution area." apply to rings?