Stacking fractional multipliers

[Stalker0]

Let's say I take 5 x2 x.5

how does stacking multipliers work with this one?

 

[Thanee]

Well, you certainly do not add them together.

Since x.5 isn't really a multiplier (only in the mathematical sense), I would apply them both normally, that is x1 total; x2 /2 basically.

Bye
Thanee

 

[Galethorn]

I'm by no means the person to ask, but I think it would work the way multipliers usually do...

x2 = +100%
x3 = +200%
x1/2 = -50%

So, (5 x 2 x 0.5) would equal (100+100-50) 150% of 5, or 7 (7.5 rounded down)...

But that's just the impression I've gotten from what's been said about the multiplication in the d20 system. I could be completely wrong.

 

[Cheiromancer]

Suppose there were three multipliers, one of which was a fraction, like, say, x 5 x 2 x 0.5?

According to DnD math, x 5 x 2 = x 6. Times 0.5 would be x 3. But if x 2 x 0.5 = x 1, then x 5 x 2 x 0.5 = x 5 x 1 = x 5.

 

[Goolpsy]

Thats because you dont calculate it the same way...

You either calculate like d&d, or do it normal

5x2x0.5 = 5 as is 2x0.5x5....

but using the d%d system, x 5 x 2 = x (5 + 2 - 1) x A x B = x (A + B - 1)
The system doesn't really include x 0.5 ... but there must be a solution there

 

[Thanee]

According to DnD math, x 5 x 2 = x 6. Times 0.5 would be x 3. But if x 2 x 0.5 = x 1, then x 5 x 2 x 0.5 = x 5 x 1 = x 5.

No, what I would do is to apply them seperately.

x5 x2 x0.5 -> (x5 x2) and (x0.5) -> x6 x0.5 = x3

Or make it as Galethorn said and transform them into sums of percentages of the base.

x5 x2 x0.5 -> +400% +100% -50% -> +450% -> x5.5

You basically just have to pick one method, as they are both fundamentally different.

Bye
Thanee

 

[dcollins]

Let's say I take 5 x2 x.5
how does stacking multipliers work with this one?

Can you give an example of this would arise?

 

[Bront]

Suppose there were three multipliers, one of which was a fraction, like, say, x 5 x 2 x 0.5?

According to DnD math, x 5 x 2 = x 6. Times 0.5 would be x 3. But if x 2 x 0.5 = x 1, then x 5 x 2 x 0.5 = x 5 x 1 = x 5.

You're doing critical hit math. That's different than real math. I'm guessing he's using something to augment a spell and the creature saved, or something like that.

 

[the Jester]

Let me use an example.

Let's say you have the spell big ray of fire, which has a crit multiplier of x5, and you crit. Let's say the monster you are fighting takes half damage from fire. And let's say you have a rod that lets your spell deal double damage.

DnD math is funny when you introduce multipliers. It is clear that x5 + x2 = x6, for instance. The x.5 is where it gets funny. I could see an argument for it being halved (x3 final result), but I could also see an argument for it being treated as a multiplier of -1 (x5 final result).

 

[Len]

Let me use an example.

Let's say you have the spell big ray of fire, which has a crit multiplier of x5, and you crit. Let's say the monster you are fighting takes half damage from fire. And let's say you have a rod that lets your spell deal double damage.

But that's not a specific example. What's that spell do? What monster are you talking about?

The closest real example I can think of offhand is casting scorching ray on a creature with the "cold" subtype (say a frost giant), which takes 50% more damage from fire.

In this case, it's clear:

Cold Subtype: A creature with the cold subtype has immunity to cold. It has vulnerability to fire, which means it takes half again as much (+50%) damage as normal from fire, regardless of whether a saving throw is allowed, or if the save is a success or failure.

It's +50%. You don't roll a different number of dice, you roll the usual 4d6 for each ray that hits (or 8d6 for each critical hit) and add 50% of that.

If you want a reason for this, consider that the caster rolls the damage (maybe a critical). The vulnerability to fire is a property of the target, not something that the caster did. So the caster rolls damage, the target takes that much plus 50%.