Consider these three cases. Treat all of them as the final battle in your campaign, with the party at no less than 80% of their resources and at the highest level of power you expect to play to.
Case A: Lone BBEG tough enough to take on the entire party
Case B: Lone BBEG with assorted underlings which individually are lower in level than the party average
Case C: Enemy party, assume they are fighting their exact clones down to equipment, abilities and buffs.
For all cases, assume that the party is competent (not overoptimized monstrosities) with comparable equipment and no one has any special advantage, be it environment, positioning, buffing or whatnot.
Player or DM? Or both?
1) Are you mostly a player, mostly a DM or do you get to wear both hats a lot? Just want to see which side of the screen you're from, not sure if this changes anything though...
Hit Rate
2) What would be an ideal hit rate range using the party's strongest attacks against the entire range of different defences available for
4) Against an opponent of equal strength and even footing, is it acceptable for your best attacks to have a hit rate of much less than 50%? Please assume that they are supposed to beat the enemy in combat, and don't account for maneuvers that may increase the hit rates yet.
5) How long do you feel combat-relevant buffs should last?
Damage
6) Without using Save or Die type attacks, should it be possible to incapacitate or kill the toughest character by direct damage in one single action by
8) If you found (6) OR (7) acceptable, how often do you feel that the BBEG or clone should be repeat this in one encounter?
9) Without using Save or Dies, should one single character be able to incapacitate or kill the lone BBEG in case A using direct damage in one action or one rounds worth of actions?
10) If your answer to (9), how much resources should be burned in such an attempt?
Case A: Lone BBEG tough enough to take on the entire party
Case B: Lone BBEG with assorted underlings which individually are lower in level than the party average
Case C: Enemy party, assume they are fighting their exact clones down to equipment, abilities and buffs.
For all cases, assume that the party is competent (not overoptimized monstrosities) with comparable equipment and no one has any special advantage, be it environment, positioning, buffing or whatnot.
Player or DM? Or both?
1) Are you mostly a player, mostly a DM or do you get to wear both hats a lot? Just want to see which side of the screen you're from, not sure if this changes anything though...
Hit Rate
2) What would be an ideal hit rate range using the party's strongest attacks against the entire range of different defences available for
- the lone BBEG in case A
- the supported BBEG in case B
- the underlings in case B
- a character fighting his exact clone in case C (ie, the armoured Knight vs the other armoured Knight)
4) Against an opponent of equal strength and even footing, is it acceptable for your best attacks to have a hit rate of much less than 50%? Please assume that they are supposed to beat the enemy in combat, and don't account for maneuvers that may increase the hit rates yet.
5) How long do you feel combat-relevant buffs should last?
Damage
6) Without using Save or Die type attacks, should it be possible to incapacitate or kill the toughest character by direct damage in one single action by
- the lone BBEG in case A,
- the supported BBEG in case B,
- the exact clone fighting the character in case C?
8) If you found (6) OR (7) acceptable, how often do you feel that the BBEG or clone should be repeat this in one encounter?
9) Without using Save or Dies, should one single character be able to incapacitate or kill the lone BBEG in case A using direct damage in one action or one rounds worth of actions?
10) If your answer to (9), how much resources should be burned in such an attempt?