Spells to mimc the 10 plagues

[Interzone]

I'm thinking of making a character who is a caster, who can cast spells to mimic the 10 plagues of egypt...
However, I am having trouble with a couple of them...

1: Turning rivers to blood.. I can't seem to figure out how to get an effect siilar to this. Closest I can think of is some sort of illusion, but they don't seem to be nearly large enough
2: Slaying of the firstborn: I have no idea what to do with this one, aside from maybe Miracle.. but I would prefer the characters level to top out somewhere before 15 so that wouldn't work...
Any other ideas?

[Dark_Mistress]

For the first one you could scale down Cursed Earth. If you want the water to actual be undrinkable/not a good idea. Make it only effect water and things connected to the water, drop the living death part of it and it should work.

For the second one a modified Plague Storm that only effects first born. Raise the level of the spell and have it only effect first born and then you could increase the area of effect.

[Tiny Coffee Golem]

wish/miracle

[boring7]

If you're trying to make it "real" there aren't any spells short of wish or miracle because the effects are too big and too specific.

If you just want to fake it with magic and legwork, #1 is easy.

Polymorph Any Object can turn 100 Cubic feet of water into anything, and while that is still nowhere NEAR the millions of cubic feet that make up a river that is plenty enough to turn a giant section of the deep riverbed into a heavy block of stone weighing down a frozen mix of red dye and something toxic (Either an ingested poison like arsenic or disease-ridden filth) to create a time-release block that makes the water red like blood and toxic for drinking.

For lower levels Major Creation can do all that but you'll have to cast it multiple times, and probably need to do so in multiple places.

And finally if you can get/make a pair of Ring Gates and collect mundane versions of the toxic brew you can remotely poison the river over a course of several days, or even just sneak it in on wagon as long as no one catches you doing it.

#2 is harder. Killing children is easy, finding specifically the first-born is quite a bit harder. If I were trying to do it I would spend a week doing legwork with a crystal ball using Scry to make a list of who all was a target "firstborn" and where they slept, then my "Angel of Death" would be a squad of Planar-Binding'd Invisible Stalkers who would go in and silently smother every kid on the list.

Arguably a limited wish with the right wording could instantly do all the divination (and explaining to the stalkers) for you, but I dunno.

[Interzone]

Ah but its not just children of course, plenty of adults were the firstborn of their parents.
Good ideas though, thanks to all of you :)