For this build, I prefer to go with light binding first than luscent singularity. while leveling up finales funkeln whenever possible.
once you get deathfire grasp, immediately go for both buffs on the map(they will help a lot). I added in nashors tooth because of its 25% cooldown reduction.
when every item has been purchased, against enemies, go in with the active of deathfire grasp, followed by light binding then finales funkeln(which ignites illumination while placing illumination) and when they try to flee cast luscent singularity in their way, exploding it when they are almost out of range of it.
this is my first build and i hope you like it