There was a reason why Lith had taken the Monocle off before the fight. He didn't want the Tree to discover about Solus nor to put her at risk in the case his plan failed and his body turned into Chaos again.
Without Solus, Lith could exploit the full power of his Abomination form and discharge the Chaos resulting from any mistake he might make on the wood of the World Tree.
Renkar swept the Yggdrasill staff over War, collecting the traces of Chaos and amplifying them with Domination. The angry blade had already flooded the Eldritch's remains with Lith's energy signature thanks to its World Mirror skill, making the process easier.
The small drops of dark matter turned into a hail of tier four Chaos Arrows that chased Vareen like sharks after a blood trail. This time, however, the Eldritch knew what would happen so he conjured the tier five spell, Devouring Wall.
A black sphere of Chaos enveloped him, making him immune to such a weak attack.
