Does any plugin perform similar to this mod?

Does any plugin perform similar to this mod?
http://www.9minecraft.net/invasion-mod/

This mod consists in:

- Spawning waves of mobs to destroy the main block called "Nexus".
- They can break walls.
- Each wall has is durability (Time until it's destroyed)
- Each wave come stronger, until nobody can survive.
- The goal is to build a base stronger enough to protect the "Nexus" and survive the most waves possible.

Soo, I would like to know if any plugin can perform similar to this mod, but with vanilla mobs, using different type of armor for each wave or simply adding more Health to them has the time passes.

Thank you.

Note: I'm Portuguese, sorry for any broken english, sometimes I mix up some words.