Spirit vs. Undead in Guild Battle

So I know with Spirits u can get the Angelic Blessing so what is the Undead equivalent? If there even is one?

Undead guild assault is called contagion with a chance chance to poison enemies. The chance almost never worked and enemies were rarely ever poisoned. And now that game has changed so that poison will not take effect on enemies with immunity, it's a pretty worthless guild assault.

Each species has 2 assaults. These guild assaults get more powerful when more leaders match the given assault. So say 10 orc leaders make it more likely for a higher level Orc guild assault. The other guild assaults are as follows and also scale based on # of same species leaders participating in chain and alive at time of guild assault:

Spirit: Angelic Blessing - heal/revive all
Undead: Contagion - chance to poison enemies
Gnome: Raises defense of all commanders alive
Goblin: Somniferous Mist - chance 2 put enemies to sleep
Dwarf: Hammerspin - deal heavy random damage
Orc: Frontline Assault - chance to instantly defeat enemy vanguard.
Human: Enraged roar - random damage
Villain: Desparia Blade- heavy damage to enemy vans
Dark Elf: random damage to all enemies alive
Elf: random damage to all enemies alive.