Having only one type of mission in wormhole seems quite boring for me, so I’ll suggest a new one.
Wormhole missions consist of waves including portals and wormholes themselves (Spawning Trouble, Black Hole Skipping, etc.) Currently they’re very few so it might be needed to improvise new wave variations.
Regarding the boss wave, I think “Shoot the Core” is the most appropriate one to be placed here.
Icon may be similar to this.
That’s all. Sorry it’s quite short .