What Du You did was straightforward and actually not very troublesome. As his professional level and skills improved, Du You is now capable of creating undead creatures up to tier eight.
To be honest, being able to create tier eight undead is something only Du You can achieve.
In terms of single-summon strength, Du You is confident that unless it's a Summoner, no one else can surpass him. Even in something he's not good at like undead summoning, he is now the strongest among the professionals.
He created several tier eight Bone Dragons and Dragon Tomb Guardians, and then Du You released his Lich King to help create lower-level undead. Anyway, these are all undead below tier seven, it's not a trouble for them.
As for tier seven undead, Du You collects bodies and waits until he has a lot, then he creates them all at once. But he generally can't collect the bodies of tier seven enemies.
