I 've been a frequent user of these charms and I found that it's kinda annoying that:
you have to wait up to 30mins until you can use any of these charms.
the cool down timer doesn't reset after leaving dungeon.
there are various kinds of them (Quick, HM Instant, Instant Mass, Rapid Revival, Rapid Resurrection).
So I'd like to put up suggestions:
the cool down time can be reduced from 30mins to shorter time like 10mins.
the cool down timer should reset once we leave or enter different dungeon instances.
having only one type of revival item that can revive you and/or other party members, instead of one charm for self and another one for other players.
Hope all or any of the above can be considered in future game changes @Hyunkel Thanks!