Get yer hot loras! Come and get your freshly baked hot loras! (For Krea-2 and Pony details, see more, below)
XL V1.0
Makes a world where everything is hot lava inside, or is cooling lava with flashes of its inner heat on view. Even manages with some Pony models, although as always YMMV there.

In the preview images, I used:
brightprotonukeBPNNo_bpn13

leosamsHelloworldXL_helloworldXL50GPT4V

colossusProjectXLSFW_90Hera

desiMasalaXLNSFWIndian_v10

transformixXL_v10

jibMixRealisticXL_v110Penultimate

realcartoonXL_v6

fenrisxl_SDXLLightning

chimeramiXL_v47

jibMixPonyRealistic_v20IncreasedRealism
ponyRealism_v21MainVAE

Pony
Pony version, with the same trigger as the XL version, "lava morph". AS its a pony, it does have a tendency to create people in lieu of what you actually wanted to create, but they are lava-y though, so...yay? 😂

It does also do objects and concepts though, and being more specific with the prompting does counter that.

I'd suggest a strength of 0.75-1.25. Anymore is messy.

I've found it to be effective on various Pony models, including those built for realism.

Krea-2
Gives you the same effect but with Krea-2's higher resolution. You can also get the same effect in different colours, if your standard red/orange lava isn't hot enough for you! Same trigger, to keep things simple.