No more lich nodes

[(XBOX)a Total Nutjob]

Hi, i have cleared all of my lvl 2 lichs sectors, i do not have enough murmur to know all 3 mods & now murmurs and lich wont spawn but he still nicks my stuff at the end of mission lol.  There is one node left red which is Luda on Ceres but this goes straight to regular mission, no mission select and nothing spawns.  I have visited EVERY node on all 3 planets he controlled to see if they'll spawn, but nothing. 

I'm literally unable to continue with lichs at this point & would be grateful if someone could come back to me on it & i'll happily provide all info you require.

Many thanks