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I agree with AlexPank, we need to add skills.
I already suggested to Tengro the idea of a spell that would allow teleportation from the underworld to a parallel point in the underwater world, and vice versa. If the hero doesn't have the necessary artifact or the skill, they die, or the teleport doesn't work (you decide).
It's a bit of a cheat, but maybe it can be refined.
I'm open to criticism and comments:o