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Undead Wall was originally a Skill zombies had that allow them to fuse with other zombies and transform into a giant undead called Undead Walls, which are aberrant masses of rotten flesh with many tentacles. It has high attack power and stats, which are made up of the combined stats of the zombies.
Once its time is over, it explodes dealing much more damage. Now, how can that be translated to Ezekiel? And then to me? I haven't seen Ezekiel ever using that Skill, but I believe what I got should be similar to what she has.
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[Undead Wall: Lv1]
A Unique Familiar Skill inherited from your Unique Familiar: [Ezekiel].
Grants the ability to manipulate and combine any nearby allied or non-allied Undead that is weaker than you and transform the combination into an {Aberrant Undead Wall}, a powerful Undead Monster whose Rank and stats is the accumulation of the combined Undead.