ToME: the Tales of Maj'Eyal

Horrifying blows says:

"At level 3, it also slows by 0% per stack.

At level 5, you can horrify enemies in a radius of 0."

Is this correct? The wiki reports:

"At level 3, it also slows by 1.25% per stack.

At level 5, you can horrify enemies in a radius of 1. "

If the zeroes are correct, why would I bother to upgrade this skill? Or do the zeroes become higher values if I increase a suitable stat?

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They should reach their actual values once you level the skill. I think it's just because of the way descriptions work.

OK thanks. I'll spend some points in it then.