More precisely, the effect the ritual currently displays is absorbing the life force from the units killed by oneself, and converting it into one's own magical power. However, Undead don't actually possess life force, which left Fang Hong a bit at a loss on how to account for this; or could it be that what's being absorbed is simply the literal meaning of 'life'—meaning, regardless of the target's type, as long as the Summoners System deems it to be 'living,' it can provide magical power?
In other words, no matter if it's a Flexible Construct, Necromancy, or something else of the sort, he can absorb a certain amount of magical power through the power of the ritual after killing them, corresponding to dead objects like stones, tables, and buildings. But he still didn't know how to classify trees, leaving Fang Hong completely baffled.
