In this game I dunno. Improved crit here only adds 1 to threat range, id guess keen weapons would be the same.
In regular dnd keen would double the crit threat range and improved crit would double it again.
So axes i believe are threat 20 only, so imp crit 19, keen 19, keen and improved, 18-20.
Keen scimitars with improved crit would give a wholesome 12-20. not bad eh?
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