The game narrates about the terrifying events....... mysterious occurrences (spelling errors) ........ some sort of unbelievably dreadful critter........
every player chooses...... has pros and cons....... and earn spells and mystic artifacts.
The common goal is...... weaken the awakened monster.....
to understand the mechanics.... be prepared for a marathon......
My family likes similarly complicated games. If you like cooperative games, one you would probably like is Shadows Over Camelot. It can be played completely cooperatively or with a traitor (which I am told, is more fun, once you fully understand the game). Here is a video about it, which is long because it shows how it is actually played when there is a traitor.) https://www.youtube.com/watch?v=Ii3yhl8wra0 It usually takes an hour or two to play.
My own personal favorite game is Lords of Waterdeep. https://www.youtube.com/watch?v=D7DvEIfrP84 This is a primarily a competitive game, although players who think someone else is ahead often cooperative at times to foil the strategies of the suspected leader. The great thing about this game is that you are hardly ever sure who is going to win until the very end, because of the secret abilities and bonuses of each character. It is very rare that you can be sure you are losing the game until the end. The game is always full of suspense and guessing about what strategy is going to be most successful.