Sure, but you can do it before battle to refill inspiration. One of the enemies will likely fail.
Sure, but that is only one inspiration - so one reroll. Just seems like a lot for minimum gain.
Also keep in mind it needs a short rest recharge to use it again, so unless you can go in frighten someone, come out and short rest, go in frighten someone, come out and short rest ..... If you can do that and take multiple short rests, the Musician feat for example will give a lot more inspirations out in play for less of an investment.
And an ally can choose to fail. So that's at least 1 per ally per 24 hours.
1 per ally, per short rest limited by both the number of allies (only works once every 24 hours) and by the number of short rests (only 1 inspiration every short rest). Like I said Musician is 2 per short rest right from level 1.
Best use is probably monk. They don't loose as much using their action vs their bonus action.
A Ranger with the Dragonscared feat doesn't lose an action and they can spam the frightened over and over as a bonus action as long as they damage with their action (can't spam the inspiration).
I suppose a damage-oriented cleric would be good too with something like Spirit Guardians up
Lessons of the First One is really getting buffed here.
It has always been pretty powerful. I don't think the new Origin feats are generally a lot better than the vest old ones, but LOFO can give you the prerequisite for the 4th level feat if you did not take it at 1st level, and the 4th level feats are pretty awesome.
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