Do I need to play the games chronologically or are they all stand alone campaigns?

ok i love rpg's but was wondering wether or not the avernum games were worth the money..been looking at the pit game as well..i,m into games like dragon age,baldurs gate etc..i amnot a gfx ♥♥♥♥♥ but i like my games to run smooth..i have w7 64bit home edition..will these Avernum games work ok on this type of system..i have 2500k processor quad,nvidia 560 ti card,8gb ram..now i know thats more than enough to play these games but what i want to know is do they run without crashing or any other problems?..ty i...

As the title asks, what does the LUCK statistic do and is it worth investing in? I am asking specifically for Avernum 6. I have read that in the initial 3 games it was a broken mechanic with a LUCK of 19 meaning you only had a 1/20 chance of dying to a fatal blow. I do not believe this is the case anymore. I hear LUCK may cap at 5 now? Is this true? Does anyone know if it is worth investing in? Thanks a bunch <3...

More specifically my demigod party killed him - it was a tough fight made winnable through many invulnerability potions, skribbane, and the joy of running away so the Priest can resurrect whoever got hit by the death curse or got a little too close when Melanchion fulminates everything within 50 yards....

not and evernum game just any new games just wondering