When this bonus is applied in the game, does it also apply the bonus for rare monsters in Lost Dungeon of Norrath Adventures?
If the named is flagged as a "rare creature" when you con them it should. I know for HA's there is definitely more that spawn when increased rare events are happening or at least from my experience.
on normal servers this bonus is one of them before the next expansion. but it only effects if the mob is flagged as rare. not sure about LDON it might be too old.
LDoN rare NPCs have the rare flag and are on encounters with non-rare NPCs, so they will spawn more frequently if bonus rares is in effect.
Will the rare spawn chance on selo's stack with any future bonus global rare spawn chance that you usually offer during some holidays?