May Lissandra will get a new passive which turns her into the queen of the White Walkers with upcoming patch 8.23, according to the latest PBE update.
In case you missed it though, the new passive creates an ice zombie of any enemy champion that dies near Lissandra. The zombie, properly named a Frozen Thrall, seeks out nearby enemies, prioritizing champions, and slows them before blowing up. Upon exploding, Thralls deal 120 damage at level one scaling to 520 at level 18, as well as 30 percent of Lissandra AP as magic damage.
The early results of new Passive are promising. Sion can die, come back to life as a zombie, and then come back to life as a zombie again. And Kog’Maw gets to explode two times on whatever poor sap he’s able to reach.
If this new passive make passes through the test on the PBE, should arrive with upcoming new patch 8.23 in less than two weeks from now.