Nationality Units-Increased limit

[Lord Apophis]

when I played my last FFH2 match, I played with options allience on. my limit of immortals was full (also3). one of my maceman with level 6 runs to a city from my allience-partner, to protect them. my maceman stand in the city of my friend and I can upgrade him to a immortal, at this time I have 4 immortals. i send all my level 6 units ( mages, priests etc.) to him and all can be upgraded.

 

[Calavente]

for a total of how many units per tier 4 unit type ?

 

[Chip56]

There are (or maybe were I havn't tried them the last versions) other ways:
->If you have more than 3 units that match the requirements you can select them all and upgrade them at once.
->Use of mindcontrol.
-> in earlier versions gifting ot tier 4 units.