+1 AC when using two melee weapons, wield weapons that aren't light, draw or stow two weapons instead of one.
Great Weapon Master: Drop creature to 0 or critical hit and take another attack as a bonus action, and -5 attack penalty for +10 damage.
I reran my numbers based off this information from the other thread. I had to include crits in my numbers to account for GWF, but did not account for misses or hit %, so take it with a grain of salt. The GWF feat is a large damage boost for Champions, pushing over a 20% DPR boost at level 20.
Level 1 16 Str
Duelist - 9.5, 9.725 crit
TWF - 13, 13.35 crit
GWF Greatsword - 11.33, 11.75 crit
GWF Great Axe - 10.33, 10.70 crit
Level 4 18 Str, Crit Range 19-20 (Champion Archetype)
Duelist - 10.5, 10.95 crit
TWF - 15, 15.7 crit
GWF Greatsword - 12.33, 13.16 crit
GWF Great Axe - 11.33, 12.06 crit
Level 6 20 Str, 2 attacks
Duelist - 23, 23.9 crit
TWF - 25.5, 26.55 crit
GWF Greatsword - 26.67, 28.34 crit
GWF Great Axe - 24.67, 26.14 crit
Level 8 Feats
-Great Weapon Master: Bonus Attack on crit of kill. The math gets really funky for the bonus attack, since you have to factor % chance to get it. I did not factor in opportunity attacks triggering bonus attack.
-Dual Wielder: Use one hand weapon (d6 to d8)
Duelist - no change form level 6
TWF - 28.5, 29.85 crit
GWF Greatsword - 26.67, 31.03 crit
GWF Great Axe - 24.67, 28.62 crit
Level 11 3 attacks
Duelist - 34.5, 35.85 crit
TWF - 38, 39.8 crit
GWF Greatsword - 40, 46.34 crit
GWF Great Axe - 37, 42.74 crit
Level 15 18-20 Crit Range
Duelist - 34.5, 36.525 crit
TWF - 38, 40.7 crit
GWF Greatsword - 40, 49.38 crit
GWF Great Axe - 37, 45.48 crit
Level 20 4 attacks
Duelist - 46, 48.7 crit
TWF - 47.5, 50.875 crit
GWF Greatsword - 53.33, 65.30 crit
GWF Great Axe - 49.33, 60.15 crit
Example level 15 Greatsword Fighter math.
25(6d6, reroll 1s,2s)+15 = 40, +.15(crit chance)*25(6d6, reroll 1s,2s), = 43.75, +bonus attack .386(15% crit chance on 3 attacks)*[13.33(2d6,reroll 1s,2s)+1.25(crit DPAttack)] = 49.38
Yes, the math for level 15 and 20 for the great weapons is messed up. Crit dmg should be lightly higher as I messed up the Crit damage on the bonus attack. So both weapons should be even slightly higher at those levels. Will fix it later.
Edit: Corrected. Also note that the Champion Archetype plays to Great Weapons a lot because of the increased Crit Range than it does to other weapons. Opportunity Attacks would increase the Great Weapon Master frequency even more.
Edit #2: For a Lark, I am showing the DPR of an alt TWF that uses unmodified damage dice on bonus attack, but gets extra attacks on the bonus attack. Starts able to use any one handed weapon to keep balance linear. Not sure what one would do with the Dual Wielder feat though losing half it's benefit, but I couldn't come up with another way to give TWF a benefit.
Level 1 - 12, 12.45 crit
Level 4 - 13, 13.9 crit
Level 6 - 28, 29.8 crit
Level 8 - Alt TWF no change from feat
Level 11 - 42, 44.7 crit
Level 15 - 42, 46.05 crit
Level 20 - 56, 61.4 crit
If you notice, the base damage of the alternate TWF is exactly 5% more than a Greatsword GWF at each level, making it perfectly linear for base damage.
Example of alternate Level 20 TWF math
Alt TWF 4d8+20 + 4d8 = 56, + .15(4d8+4d8) = 61.4
Non-Champion Greatsword GWF (20 crit range only)
Level 20 - 53.33, 57.55 crit
Math - 8d6+20=53.33, +.05(33.33) = 55, + .1855(13.333+.417) = 57.55
In this way, the TWF stays linear with the Great Weapons straight from level 1, losing some power there, but gaining it later. Do not forget a TWF loses the bonus attack if he uses second wind, gets less benefit from action surge, and hits for less on opportunity attacks. However, the TWF can also use the bonus attack to attack while doing another action other than attack, which a GWF could not do.
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