I can confirm that the 4th active character slot is received upon reception of at least 5 medals. I was at 3 and had hoped to catalogue whether it was at 4 or 5 that the cutoff was, but I found a way to gain 2 medals in a single day somehow and that blew me away, but I was thus not able to confirm 4 or 5. My guess is 5 simply because of the ease of using that number.
Anyway, that's the confirmation at least.
I can also recently confirm this. 5 it is.
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"A tale is but half told when only one person tells it." - The Saga of Grettir the Strong
- Current: Kemen (D'hara) - Past: Kerwin (Eston), Kale (Phantaria, Terran, Melodia)