Quests that require you to complete them with a team of units from a certain game
Use geneology units to beat this new internal map
Use awakening units to beat this map
Etc it could add to the fun
Reward: Should be a series of maps that allow you to get a TT unit character from that game/banner in the end.
It wouldn’t really be challenging but would add to the fun appeal that every has of building teams from games
My only qualm is that they would have to be 3/4* units that most people will have instead of gated 5* units. I am not sure if there are 4 3/4* heroes from each game, though there might be, I don't know. (Also, this is why the Askr trio and Fjorm are used in quests so much, people are very nearly guaranteed to have them.) Otherwise that would be a lot of fun!
I think If the made it like the GHB infernal 2 orb quests that lasted for like 360/180 days.
It could just be extra content and then when most people get more 5* they could fill out their roster to complete it no rush but for most players they can easily put together an awakening/fates team etc
The only game with fewer than four units available at 4* is Radiant Dawn, which only has Sothe and Oliver. Thracia and Path of Radiance each have four: Nanna, Reinhardt, Finn, and Saias for Thracia, and Soren, Titania, Oscar, and Black Knight for Path of Radiance.
If we decide not to count TT units and only GHB units in the rotation, then RD drops to 1, Thracia to 2, and Path to 3. Sacred Stones barely makes the cut at 4 (Eirika, Seth, L'Arachel, Valter).
In other words, IS *really* needs to go back to Tellius.
Pokemon GO
Fire Emblem Heroes
Fate Grand Order
Dragonball Legends
Dragalia Lost
IV Calc
Heroes