Just imagine, going deep into the desert to mine some rare mineral, a "spice" if you will. You look off in the distance and see some particle effects getting thrown from he sand near you. Next thing you know, you're sprinting for solid land, because it's a ****ING SANDWORM!
It's not "Unpredictable", sandworms should leave some definite trail easily seen if your looking for it. It should also emit a somewhat audible sound, just a subtle hiss of sand against keratin. Perhaps it could also surface a few second before making it's attack.
As for coding difficulty, hell yeah it'd be hard. But it's a ****ing sandworm, any amount of effort would be worth it.
it could just noclip through sand, with a particle effect.
One hit KO?
I think when I first mentioned this, my idea was to have them actually pick up the player and throw it, using fall damage to attack... I'm not sure if I still like this idea, but wouldn't it be exciting?