Make sure that no creeper is stuck anywhere in the environment. (Are there red dots left on the radar?)
There where no red dots on my radar but I'll double check I remember killing all of them
( i double checked and I killed all the creepers I still can not progress and the last Thorian node is not taking any damage from my shots )
Try to repair the game. (in Origin > Game Library > right click ME > Repair)
I doupt that will help, but lets make sure.
If it don't helps, you should try another save or restart the Mission.
