Passing Variables, Saving Fight Status

[Hateborne]

Specifically how does one send variables between NPCs? Can some of the prebuilt events be used? Are globals known to cause issues?

I don't need anything particularly strong, just something that can tally up random point scores at the end of each wave. Rewarding the players every 5 defeated waves.
(and of course, some way to get Bob to instruct the wave leader to attack the quest starter)

(thank you for the reply!)

-Hate