An incarnation of Laserbeak, and condor/cyborgs for the Cosmic Era
Do not meddle in the affairs of wizards... -- Gildor, via J R R Tolkien
The first sign of the Army of the Lost are the legs. Blown off legs, hopping along wearing their military boots. And not long afterwards, the rest of the Army arrives, and the horizon from left to right is filled with the decomposing bodies, many of which carry weapons. Unless you can outrun them or fortify your position, you will soon be joining this army of the Undead.
The party wakes up in an inn around a table with wine goblets near at hand. They have forgotten all that happened the last day. As they seek to find the truth they come in contact with a man that gives them a job which pays quite nicely.
When they have finished with this rather dubious assignment they are invited to dinner by the the man...