While servers are down

Was wondering if yall could help me plan for dnd 5e this week.
2 groups
One group is Moving 1000 Kobolds 100 miles i need some encounters/ challenges to throw at them. surely towns/ city’s will be terrified seeing wagons of kobolds approach.

Other group is restarting after a break. and im throwing them into a new era of the world, more Old Gods/ Ctuhulu themed. like Illithids, darkness that makes you do mad opn failed wis saves. just lookin for ideas. ty!