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Magic (normal): (Caster Level/2 + 1) -1
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You probably meant "- (caster level /2)" or something like that ?
Also, (caster level/2 +1) -1 == (caster level / 2).
What I was trying to say was your caster level/2 + 1 made into a negitive. In a mathmatical statment it would be.
-1(CL/2 +1)
I need to think of a simple way to write that.
I'll test that system, as I've a female PC that'll eventually want to bear children. (As a noble, she'll need heirs.) She's a multiclass aristocrat/sorcerer, whose bloodline boast to have been mingled with dragons' ones, which is the reason behind her family's nobility, according to their legends.
Thanks a bunch.
Age +1, Good Constit (14 Con) +1, actively trying +2, fertility magic +3 (at least), final bonus +7 or better. A 8 or better is needed, so about 65% chance (or better, depending on the number of XP she'll get).
Sounds about right.
Then, rolling on chart from page 87 (not a good name, the page count is likely to change 
).
That's more of a momentary thing to show where I took it from... it'll change, that's why I posted the chart.
% chance to get pregnant: 77 human+2 Con bonus = 79%.
Now, the combined chance becomes simply 51.35%.
Not bad chances IMHO, but remeber, one after the other...
Also the Fertility spell adds 5d6 points to the Base Chance.
That's a minimum increase of 5%, a max, of 30%, and a mean of 17.5%... so her fertility chance could be anywhere between 84 to over 100%, likely being somewhere in the high 90s
I wonder what a woman trying NOT to would look like...
So, the second roll is made by the mother, and the first by the father ? Why two rolls for the same thing ?).
It's like a critical roll. If you roll a conception then you roll a d% to check vs. your species if it was sucessful. This is to acount for the fact that some races just breed faster then others.
Also, unless there is something seriosuly wrong with him in the verility department why should a male roll? Unlike women, men are almost always physically capable of sireing a child.
It was proposed in the work-in-progress guide to use a mechanism similar to the critical rolls for multiple kids (roll a 20, you get a chance to have twins, roll again a twenty on the confirmation, you may have triplets, etc.).).
Hmm... we could always apply that to this. Sounds good.
The "threat range" (we should definitely find a better name) should be what ? 20 for races with low natality (elves, dwarves), 19-20 for normal, and 18-20 for races that breed like rabbits (goblins, orcs) ? Should the Constitution score of the mother be taken into account for this (since a frail mother is less likely to wait for several youngs without at least partial miscarriage) ? And if so, how ?).
Hmm... I agree... maybe low con should lower the threat range by one.
Finally, a little question. Player characters (but not necessarily NPCs) can always choose to fail their rolls (this rule is only stated for saving throws, but it's obvious one may voluntarily blunder an attack roll or an ability/skill check). What about this one ?
No. This is one of those rolls that I feel the GM should make. The players control the actions of the PCs, but not every single biological function.
This is one of those things I really don't think the player should even know about until they have a pissed off single mother hunting them down, or are having to make Fort check in the morning to avoid pukeing up last nights rations.
On the one hand, it's probably better in-game to avoid forcing pregnancy on a character if the player is opposed to, simply because this can ruin the fun for that player. On the other hand, this is neither a saving throw, nor a skill/ability check, nor an attack roll -- it's a kind of dice roll akin no other in the d20 system (I remember seeing in the work-in-progress a mention of using the Fort save for this roll, though). There's maybe matter for a sidebar.
I think stuff like this is talked about with the players beforehand. It is as much part of life as death, which is a daily fact of life to the PCs.
It really depends on the style of play. Let me take a page from Dragon 300 for this... well, more like use the format:
Lighthearted Game: Pregency has nothing to do with the game, except to maybe show the strengtin aparant NPC faimly bonds. Almost nothign to do with the PCs.
Standard Games: With Female PCs, these roles are talked about before hand and only if the player is willing or wants her PC to have children. With male players this diffrent... if he wants to sleep around TOO much then you MIGHT stick him with a pissed off father with a very pregnant daughter, bit no rolls.
Mature Game: If female PC partakes of sex, it's rolled for. If men have sex with women, it's rolled for. Sex and reproduction is a mature topic, and in a mature game if you play you may very well pay.
Vile Games: Female PCs should avoid all forms a Fiend and Evil Dragon, for they all want to sire some form of half-breed spawn and she looks like she'd be a good mother...
