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The swarm normally deals damage to any creature within its space.
If the swarm has no idea a creature is there can it still do damage?
Specifically an intelligent swarm in the same space as a character protected by the mythic ability undetectable?
By the rules, any creature in a swarm's space takes damage. It doesn't matter if the swarm knows they are there or not, in the same way a fireball doesn't care if your are invisible or not.
The specific ability might indicate otherwise. What undetectable ability are you talking about?
Edit: I assume you mean the legendary item ability?
Undetectable: This grants its bonded user the ability to become utterly undetectable while invisible. While invisible and in physical contact with this item, the bonded creature can't be detected or scryed by any method.
I see nothing about that that would prevent you from taking damage within a swarm. The swarm doesn't need to know you are there - you just take damage.