This was a fun one, its nice when there aren't save skills everywhere.
Merges | Dragonflowers | Boon/Bane | Supports
Dimitri: +10 | + 15 | +Atk | S with Byleth and Summoner
W!Felix: +10 | +10 | +Spd
S!Sylvain: +10 | +10 | +Spd
S!Byleth: +1 | +10 | +Atk | S with Dimitri