Seems a little focused on throwing the daggers.
How does the crit range change when used by a Champion or otherwise increased crit range?
I didn't intend on the crit range stacking with Champion. It's hard to imagine a Champion fighter wanting to use daggers anyway. Being able to draw and stow 2 daggers instead of one is more helpful than just throwing them.
What size superiority dice does this feat grant to add to the damage?
If you want to reword the feat so it doesn't include the superiority dice that might bring it more in line.
There is a suggested disarm option rather than the more powerful battlemaster maneuver in the DMG. The whip can already perform that.
I didn't intend on the feat granting superiority dice. Too powerful.
What disarm option are you talking about???
That feat doesn't specify that it requires a whip to perform those maneuvers. As such, for some characters its pretty good to take even if they're never going to use a whip.
Something else you might want to think about is what classes might want to use a whip in combat and whether those classes are proficient in it. (Martial weapon).
Yeah a simple re-wording would solve the problem requiring it to actually be a whip haha. Good call out on proficiency. The feat would grant proficiency too.
Sai = Club. Maybe consider houseruling Defensive Duellist to work?
Morningstar: Look at the Fell-handed feat in the UA about feats. Not sure what would be regarded as distinctive enough about morningstars for them to get a special feat though.
Shuriken = Dart. The existing Sharpshooter feat works pretty well already.
I've actually made a feat in 4e for the sai and shuriken. A guy wanted to be a ninja rogue and specialize in throwing stars so I made him a Shuriken Master feat. I don't remember ALL of the exact details but it was something like-
+1 to attack rolls made with Shuriken
-could be used as a 1d4 slashing weapon(like in real life)
-could throw up to 3 at a time
-could throw double range(only one at a time)
Note: I considered the Shuriken to be a concealed weapon.
If I were to remake this feat for 5e, I would drop the +1 to attack.
And I had another guy who wanted a character based off of TMNT Raphael so he was a Tempest Fighter who dual wielded sai. I used the handaxe as the base for the sai. 1d6, off-hand, thrown, etc...
I made him a Sai Master feat that included-
-When wielding a sai in each hand, gain +1 to AC
-When hit by a melee weapon attack, make an attack roll against the attack, if the roll is higher, you parry the attack and take no damage.
-Deals bludgeoning or piercing damage(your choice)(like in real life)
If I were to remake that feat for 5e, I would downsize the damage to 1d4.
I agree that it would be difficult to make a feat around the Morningstar, but I've always been a huge fan, and I did at least retool the 4e Morningstar.
The one handed Morningstar was +3 to attack, 2d4 damage dealing both bludgeoning and piercing damage and had the high crit property.
The two handed Morningstar was the same except 2d6 damage and had the brutal 1 property instead of high crit.
I think at least some of that would carry over to 5e pretty well like the damage die and damage type. Not sure what to add to make it more exciting but I'm sure I could come up with something.
Both of those feats were huge successes. The players and the rest of the party all enjoyed them.