Writhing Chrysalis

Writhing Chrysalis's second ability will resolve before Writhing Chrysalis does. If Writhing Chrysalis is countered or otherwise leaves the stack in response to that triggered ability, the triggered ability will still resolve as normal.

A card with devoid is just colorless. It's not colorless and the colors of mana in its mana cost.

Devoid doesn't affect the color identity of the card for the purposes of the Commander variant. For example, while Abstruse Appropriation is colorless because it has devoid, its color identity is still white and black, and it can't be included in a Commander deck where the commander's color identity doesn't include both white and black.