If I recall correctly, that's a passage from the novelization of ROTS(Sithisis) The whole thing is a metaphor. Sidious doesn't literally shoot a crystal or have worms emerging from holocrons that he consumes and then consume him. It's one of several worm and dragon based metaphors in the novel that are designed to describe internal conflict as well as the mental and emotional aspects of utilizing the Force. As I said, this passage refers to the means in which Palpatine hides his true appearance, with the novel working with the belief that Palpatine hid not only his nature but his actual physical self from all those around him.
Sithisis I part of a collection of non-canon comics. Have you looked at what else is in the Visionaries set?
So again. The comic is a metaphor. It doesn't even have any dialogue. It's just a collection of non-canon images. Moreover, they're non-canon, both to the Disney "canon" and to the Legends continuity.
__________________ RealistRacism: "Sheevites, much like the Banites, were meant to increase in power with each member. From Lightsnake to Gideon to Azronger, this was supposed to be the case. However, knowledge must've been lost in some kind of Gravid-like incident, as Az turned out to be a mid-tier debater with a sub-par track record, sh!itting all over Tempest's legacy. Sad."
__________________ RealistRacism: "Sheevites, much like the Banites, were meant to increase in power with each member. From Lightsnake to Gideon to Azronger, this was supposed to be the case. However, knowledge must've been lost in some kind of Gravid-like incident, as Az turned out to be a mid-tier debater with a sub-par track record, sh!itting all over Tempest's legacy. Sad."
__________________ RealistRacism: "Sheevites, much like the Banites, were meant to increase in power with each member. From Lightsnake to Gideon to Azronger, this was supposed to be the case. However, knowledge must've been lost in some kind of Gravid-like incident, as Az turned out to be a mid-tier debater with a sub-par track record, sh!itting all over Tempest's legacy. Sad."