kensai with sword. 1 attack. at 5th 2 attacks. with flurry 4 attacks, at a price of 1 ki point and lose your bonus action. Which means you can't use an off hand.
Even if you could use your sword, this would still suck.
Kensai without Flurry:
1st: 1 attack, +1d4 unarmed (2 attacks per round, half attacks suck)
1st +1 ki point: 1 attack +2d4 unarmed (3 attacks per round, 2/3rds of attacks suck)
5th: 2 attacks, +1d6 unarmed
5th +1 ki point: 2 attacks +2d6 unarmed
6th+: Same. 3-4 attacks, 2 with sword, 1-2 with unarmed 1d6-1d10. (3-4 attacks per round)
5th level party+: with haste +1 weapon attack (4-5 attacks per round)
Fighter:
1st: 1 attack, +1 attack off hand weapon (2 attacks per round)
2nd: action surge: 2 attacks, +1 attack off hand
5th: action surge: 4 attacks +1 attack off hand, otherwise 2 attacks +1 attack offhand (3-5 attacks/round)
11th: 6 attacks +1 offhand, otherwise 3 attacks +1 offhand (4-7 attacks/round)
20th level: 8 attacks +1 offhand, otherwise 4 attacks +1 offhand (5-9 attacks/round)
5th+ level party: haste. 3-5 attacks becomes 4-6 attacks, 4-7 attacks becomes 5-9 attacks at 11th level. 5-9 attacks becomes 6-10 attacks at 20th level.
Action surge is once per short rest. At 5th level, flurry is five times per short rest.
5th level monk (kensei), great sword:
Base: 2d6+4 x2, 1d6+4 (martial arts) = 29.5
Flurry (5/short): 2d6+4 x2, 1d6+4 x2 =37
Across 2 combats, 3 rounds each, 6 total = 214.5
DPR potential: 35.75
5th level fighter (battle master), short swords (because you were looking at number of attacks):
Base: 1d6+4 x3 (two weapon) = 22.5
Action surge: 1d6+4 x5 (2 base, one twfing, 2 action surge) = 37.5
Plus: 4d8 superiority per short, no miss = 18
Across 2 combats, 3 rounds each, 6 total = 168
DPR potential: 28/round
5th level fighter (battle master), great sword:
Base: 2d6*+4 x2 = 24.7
Action surge: 2d6*+4 x4 = 49.3
Plus: 4d8 superiority per short, no miss = 18
Across 2 combats, 3 rounds each, 6 total = 190.8
DPR potential: 31.8
The monk does fall behind in damage at 11th and 20th, but then they have more ki than they know what to do with. The ability to stun on nearly any hit switches their role from a damage dealer to a controller.
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