.. How do I get the voodoo antiroot?

It's on the ghost ship.

How do I get on the ghost ship?

Have you explored the ship at all?

The voodoo antiroot glows.

What have you seen glowing?

The glowing crate seems to glow.

It's in the animal room, down the hatch on the main deck and right through the passage.

The voodoo antiroot is inside the glowing crate.

How can I open the glowing crate?

Don't forget to look inside the open glowing crate to take the voodoo antiroot.