The demons will swim to her and fight her. (The dead humans mostly huddle in the shallowest areas they can find, trying not to be noticed.)

Eventually the swamp gives way with unnatural suddenness to a desert of baking sand in the midst of a permanent sandstorm. The demons and petitioners stumble through it blindly, their flesh constantly regenerating as the sand erodes it away.

Iomedae has very good armor and fairly good damage reduction and will pull her visor down and trudge, full of murderous rage.

A few of the demons have enough damage reduction of their own to see her. Most of them just attack, but one proves to have telepathy (and chooses to use it).

Who are YOU? Why do you have ARMOR? Did HE send you? I hate you!

The god of this place? I think he sent me. Do you want to help me kill him?

Of course I want to kill Him! I hate Him! Even more than I hate you! But you're here and He isn't! Gimme your armor or I'll kill you!

If you try that I'll kill you, and it won't be difficult for me, she says patiently. If you come with me instead, I will eventually figure out how to get to Him and then we can kill Him.

I don't believe you! says the demon, but they don't attack.

You don't have to believe me! You can just follow along and see whether I kill God or not. Do you know if He has servants anywhere on this plane?

They don't come down here because if they do we kill them! Just like I'll kill you if you're lying!

And are there demons that can go to Heaven if they want to?

The bigger demons go to earth sometimes! I hate them! I want to go to earth!

Does hating them help you get strong enough to go to earth?

What?!

Sometimes, for me, hating people is just a distraction that gets in the way of growing stronger so I can kill gods.

You haven't killed God either so what do you know?

I am much stronger than when I started and I did kill an archangel God sent after me. She will try to produce a mental image for the demon.

. . . I don't believe you! Their heart, or whatever they have in there, is not really in it.

If I were making things up I'd make up something cooler, I'd say I fought five of them and got them to explode each other in a chain reaction. 

Iomedae can almost see the gears turning in the demon's head, and not just because part of their face is currently missing.

Tell me how to go to earth and kill angels!

When you get in fights and win them, you get stronger! And if you are a paladin like me then you get all kinds of magic advantages at killing powerful Evil things like God! To be a paladin you have to be Lawful Good, which is very hard, but no one is as good as paladins at murdering powerful Evil things with a sword. 

Now, if you get in fights and lose them, you'll die, so you have to be smart about which fights you pick. And if you just murder people who aren't bothering you for no reason, you can't be a paladin, because that's being Evil like God. But if you fight in self-defense, or the defense of others, that's all right and not being Evil like God.

You take that back! I'm not like God! I hate God!

I think you're better than God! God tried to kill me and you didn't do that, you tried to talk to me! But when you try to kill people who aren't doing anything to you, then you're being like God. And when you don't, then you're being the opposite of God.

Who does the opposite of God get to kill again?

If you are the opposite of God, like me, then you get to kill God. I am Lawful Good. That is the opposite of Chaotic Evil. I think God is probably Chaotic Evil, but if He's some other kind of Evil I can still kill Him. Paladins can smite any kind of Evil.

Fine! Let's go kill God! I still hate you but I'll kill God first and you second!