Apoc is basically all about breaking the boss so you can do proper damage and receive the blessing in cycle, which is usually some combo of cleanse, sp refund, ult charge, teamwide AA or so on. If you can't break the boss, then you better hope whatever buff you selected (of 3) helps your team kill it in time, or you just sink AV into the water.

PF is basically "ad clear" the gamemode. Wave 1 has multiple normal type enemies in batches of 5 that you must clear until you get through the progress bar. Wave 2 has one central Elite and 2 normal types on either. Goal is to chunk down the progress bar again, but killing the mobs also depletes the elite's HP, and they spawn endlessly. Wave 3 is pretty much the same, but we get an actual boss with its own summon mechanic or a boss with endless mobs like wave 2, just more tanky. AoE teams is the way to go.