Druid vs Necro background

[Morachidi]

So watching the background of the art of D vs N

I see cool things on the side of the druid:
flesh eating plants  :cheer:
Gaint Ent
Swarming beas
...

Also cool things on the Necromancer side
I think the tombs are spawnpoints
More undead  :silly:
...

But what is the thing in the background right above (it looks so evil and big) hope this is included in the expansion  :evil:

Anybody any thoughts?
You can find the picture in Etherian Chronicles, the Official Mage Wars® Newsletter.

[Morachidi]

Oops found it myself

Additionally, the Necromancer summons and controls evil spirits – ghosts and wraiths.  His has an affinity with death and disease, and can quickly spread plagues across the arena.

[Shad0w]

Moving to lore