add more Tonberry content

[Enkidoh]

Do the Scholar quests, you will get story. Though they need to continue it, it is pretty decent as is.

^This. Also, due to the events of said SCH quests it means new tonberry content is now very unlikely,

given the SCH quests involve the source of the tonberry plague and are resolved by the player ultimately destroying said source forever - hint: it's a Voidsent demon contained in a jug

.

The Wanderer's Palace dungeon (both original and Hard Mode) involve the tonberry story too, so I think that is going to be as much as you'll get about it I'm afraid.