Hi,
When taking Effigy of Combustion (5/5) in Volatile Zombie, and Legion in Infernal Shade, the Volatile Zombie explosion still only casts one Shade. (Instead of two or three).
Maybe Legion only works on direct casts? Wording on both nodes is slightly ambiguous.
Although, I noticed that there’s a slight delay before the additional shade when casting manually; I use minimal duration shades (5/5 Wildfire + Combustion), and the enemy often dies instantly (because of Sacrifice, and it procs Combustion) - maybe this can be a factor?
(In any case, there are still remaining nearby enemies for additional Shades to latch onto).