Tarith activates his ring of blinking, and attempts to walk through the cocoon to retrieve the Dryad.

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I am assuming that she is 5 feet in front of him, and I can try multiple times.
so...
1-50 means failure
(1d100)[44] damage(1d6)[6]
(1d100)[63] damage(1d6)[4]
(1d100)[48] damage(1d6)[1]
(1d100)[56] damage(1d6)[5]
(1d100)[65] damage(1d6)[4]