D&D 5E (2024) The value of Sap Mastery

[FrogReaver]

I looked at SAP Mastery and I found the following to be good estimates of it's value in the following situations.

1 incoming attack ~62% damage taken
2 incoming attacks ~81% damage taken
3 incoming attacks ~87% damage taken
4 incoming attacks ~90% damage taken

Note: These are rules of thumb as the actual values can vary a bit depending on accuracy and advantage/disadvantage of the PC and enemy, but they still were close enough together that I thought the rule of thumbs above wouldn't be misleading.

Altogether I expect this entails that equipping a shield while also having sap mastery likely decreases damage taken very significantly. Probably by >30% in most situations (I'll try to compute a tighter estimate later). In short, sap+shield likely increase defense enough to compensate for missing out on the offensive impact of GWM and a Greatsword/Greataxe in many circumstances, including multi-attack ones. It also leaves the feat slot open, and helps even when the enemy decides to attack your ally, both of which are very nice.

I've included a sample chart. I actually computed this for different variations of advantage/disadvantage and even for 1 PC sap attack.

 

[FrogReaver]

So I did a similar comparison with sap and a shield vs no sap and no shield.

1 incoming attack ~45% damage taken
2 incoming attacks ~61% damage taken
3 incoming attacks ~67% damage taken
4 incoming attacks ~69% damage taken

The corresponding EHP values (probably a bit more comparable to DPR increases)
1 incoming attack ~ x2.21
2 incoming attacks ~ x1.63
3 incoming attacks ~ x1.50
4 incoming attacks ~ x1.44

For comparison a level 5 reckless attacking Barbarian does ~60% more damage with a greatsword and GWM compared to a 1d8 weapon with sap.

Fore comparison a level 5 reckless attacking Barbarian Berserker (2d6 damage bonus on reckless attack) does ~43% more damage with a greatsword and GWM compared to a 1d8 weapon with sap.

Note: Having only a shield itself and no sap on this chart can be estimated at about 80% damage taken.

Example of a sample chart is below.

 

[bedir than]

Sap only impacts a single attack role by the opponent.
A multi attack PC should distribute Sap amongst a swarm since the same opponent can only be hit with it once

 

[FrogReaver]

Sap only impacts a single attack role by the opponent.

Correct. This is being factored in.

A multi attack PC should distribute Sap amongst a swarm since the same opponent can only be hit with it once

Possibly. There's still the question of focus fire potentially being better.

In any case, this is not currently being factored in and would improve the defensive numbers especially for the higher accuracy scenarios.