Cradle of Shadows
I know that there are videos on out there but they are generally either just shows groups killing the bosses (with no explanation whatsoever) or groups in there burn boss so fast that they skip mechanics. There are also groups who simply prefer classic written guides where they can copy past exactly what they want and they dont have to watch 1 hour long video just to find a 1 minute fragment. So here it comes.
Word of advice before you enter:
Cradle of Shadows:
1st + 2nd + Part Of Final Boss Global Mechanic:
Light is good, dark is bad. If monsters are in shadows, away from light they get greatly reduced damage like 1/10 or even less of normal. Monsters, trash, bosses have to be chained, lured, kited into braziers of light so they will be taking full damage. Also when player is in dark he will start taking enviromental damage and will get snared + his screen will get creepy dark. Stay in light. As you walk throught corridors light braziers around you so you have somewhere to wait and kill trash spiders that chase you.
Go to the following link for the mechanics of each boss in Cradle of Shadows: