So I am building an oread cleric and I wanted to use a sling, now the 1d4 for a medium sling looked a little sad so i turned to the halfing sling staff with 1d8, now oreads can cast magic stone as a spell like and the description of that spell is as follows
You transmute as many as three pebbles, which can be no larger than sling bullets, so that they strike with great force when thrown or slung. If hurled, they have a range increment of 20 feet. If slung, treat them as sling bullets (range increment 50 feet). The spell gives them a +1 enhancement bonus on attack and damage rolls. The user of the stones makes a normal ranged attack. Each stone that hits deals 1d6+1 points of damage (including the spell’s enhancement bonus), or 2d6+2 points against undead.
now my question is, this spell seems to up the damage size category of the pebbles to Large, kinda like the spell gravity bow, and give a +1 enhancement bonus to the ammo as well as dealing double damage to undead, the really question is does the 1d6 dmage dice replace the 1d8 for a medium sling staff? or would it make the halfling sling staff deal large size damage of 2d6?
Well you posted this in the Rules forum so I'll give you the Rules answer:
It' 1d6. The reason is because that's what the spell says it does.
If you're playing a home game ask the GM, they might go easy on you (totally wouldn't be overpowered). If they don't then it's still good for dealing with those pesky undead.
persoanlly i'd read this as intended, was inteded to be a buff spell for slings so i'm on the side of that, dipping a feat into using a halfling sling staff ain't nothing to snuff at
now my question is, this spell seems to up the damage size category of the pebbles to Large
You are wrong about this. This spell ignores things like size category completely, much like magic missile does 1d4+1 whether cast by a pixie or a giant, Magic Stone does 1d6+1 regardless of who casts it as well.
Gravity Bow (if it applied to slings) would, by chance, change your damage with a sling from 1d4 to 1d6, much like this spell does. It would though change a small creature damage from 1d3 to 1d4, while the Magic Stone spell makes it 1d6 for everything.
Obviously there are situations where one effect type is superior to the other, a small creature with a sling obviously prefers that Magic Stone works the way it does, rather than like gravity bow. In your case, a medium creature with a sling staff, it doesn't help you.
House rules to make it work in a beneficial way to you wouldn't break anything really. Research for a 'Gravity Bullet' spell would also be reasonable.
now my question is, this spell seems to up the damage size category of the pebbles to LargeYou are wrong about this. This spell ignores things like size category completely
that's not entirely true, this spell can't be used by a large sling, so it kinda has the effect of making it 1d6 of a large sling bullet instead of 1d3 for a medium stone, it is kinda like gravity bow in that sense but not really, I'm currently trapped as the GM for the foreseeable future and I got other characters lined up so I'll see if it flies with whatever GM I get if I ever do lol and if not oh well. Most of the good feats for slings are halfing only which kinda blows