The Ant Knight's Willpower
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The power of the Swarm Body Ego completely fused with Lancelot's weak and smaller soul. Its powers so strong that it completely overwhelmed it. The fusion was painful, as it made Lancelot's very soul struggle to keep itself from shattering into pieces.
Maria had not completely fused with him because of this, as Lancelot had a smaller soul compared to most of her other Undead, mostly because he was fairly new into the group, and unlike Kuro, Darkbound, or Mercury, whose souls were composed of hundreds of smaller souls, he was just a single soul.
However, it wasn't as if Maria couldn't do it. She quickly brought upon dozens of souls that were floating around, the souls of the very Ice Giants they defeated, as she raised them as Undead while merging a dozen other souls into Lancelot's own soul, strengthening it. A+ Rank beings' souls were surely strong.
FLUOOOOSH!