i have found while playing legit many many hundreds of them and yes its very addictive. but congrats on the drop.
make sure for every game its 8 players
chaos is #1 because it has static maps, tc 85, tons and tons of champs and unique packs.
kill monster packs as fast as possible, kill every monster in chaos dont skip and just pop seals or clear champs you waste monsters. every monster in chaos can drop a zod or a griffon it has max tc for the drop table. i like to use when starting out a blizzard sorc and a fb sorc team so i can kill easy areas like ancient tunnels and mausoleum also i love pit. you can find hrs without any advanced gear with chest poping and this does work. split the job between 8 characters so 2 does act 1 2 does act 2 3 does act 3 and the rest do act 5. i have found hundreds of bers from random chests like this. also enable open chests while teleporting.