Per the 8.0 official notes, there is supposed to be a limit of one Immortal Troop per team.
But apparently, if you manually key in a specific Team Code you can in fact build and run a team with multiple Immortal Troops in the party:
And because every PVP attack team doubles as a defense team, this means:
This is, honestly, not the first time that manually inputting a Team Code isn’t fully validated against restrictions (either for the team or the game mode), but this has the potential to be a HUGE problem for the “top of the leaderboard” PVP meta.
It also raises a tangential concern: are Immortal Troops allowed to appear in random summon tables, and if yes, is this allowed to circumvent the usual limit? (For example. can a Royal Engineer summon Immortal Titanius? especially if there is another Immortal Titanius already on team?)