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Can decrepefied heroes be attacked by Frost arrows, Glaves of Wisdom or other toggle based skills with pure damage?
No, as these spells are Orbs which rely on their autoattack components.
However, heroes that are decrepified can CAST these abilities by doing so manually as if there are a spell. If the ability is on autocast, this is not true.
I believe you could attack with Pugna decrepified targets if you had any Orb effect in wc3 Dota, but don't know if you still can. In Dota2 you can't.
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