For some reason, Defensive Strike doesn't work the 2nd time I use it in battle (at least once I get Lyvia). To repeat the bug, have both MC and Lyvia use it on the first turn, do something else (like regular attack) then Defensive Strike with both again. No defense buff. Tried waiting one more turn, same thing. The 3rd time works though. It can be quite frustrating when one has a defense debuff and gets attacked, taking a massive hit even though they should've been defending.
Also, both Tia and Lyvia were able to equip an old buckler despite only having 3 in Armour Proficiency. That should only be enough for "normal armour" (whatever that means, but I'm guessing iron armour), it's only at 6 that the tooltip states the character can equip bucklers. Speaking of stats, I haven't noticed any difference in HP nor EN after increasing Constitution. Does it only apply after one level up? No clue about the other stats, I didn't check, but HP and EN are both visible on the left screen when improving a stat so that was easy to see.
On a completely unrelated note, does someone have the link to the mod that changes Frisha's father? Tried to find it but couldn't. If not it's ok, I can live with it as my headcanon.