Eternal Darkness: Sanity's Requiem/Chapter 9

Food for the Beast
The boss monster you will battle depends on the path you chose early in the game. For a look at each monster's entrance watch the video.

Boss Pattern
Each monster basically follows this pattern:

Stage One

 * Attacks with projectiles

Stage Two

 * Summons zombies

Stage Three

 * Constant lightning attacks

Whenever you get too close, the beast will attack you with quick, deadly attacks, so stay away for the first few stages.

Xel'lotath (green) Beast Strategy
Have the following spells ready (assign to quick keys):
 * 1) Damage Field (3 or 5 runes, red)
 * 2) Magickal Attack (3 or 5, red)

For stage one, simply run around the checkerboard floor area, about 25 feet from the beast (I line myself up with the second row of archways). Don't get too close to the beast or he will start raining down lightning attacks. Avoid the green projectile attack, by running from side to side. Note that after the beast attacks, he will be covered in a green electrical coating. This means he is vulnerable. Immediately after the beast attacks, cast a three rune Magical Attack. He should recoil if you were successful in your attack. Run around to avoid the attacks and follow the same procedure. Hit him a few more times to reach stage two.

Stage two can be one of the most frustrating and difficult parts of the game. If you're having trouble, try this: Choose a side (left or right) and hang out near the second row of archways. As the beast summons zombies, perform a 3 or 5 Damage Area spell. This will shield you from the zombies and keep them from bothering you for a brief period of time. Note that a few seconds after the zombies are summoned, the beast turns green (signally vulnerability). Try to cast a 3 or 5 rune Magickal Attack spell so that the shockwaves hit the beast while it is green. Timing is crucial here and you may have to run around to finish zombies, replenish magick or replenish your health if you get hit. Successfully hitting the beast with the Magickal Attack a few times will get you to stage three.

Stage three is pretty simple, really. Simply make a lap around the opening while the beast attacks you. After the fifth or sixth attack, he will need to recharge his magic. Immediately after the last attack, use your 3 or 5 Magickal Attack spell to hit him. Doing this a few times will kill him off. Congratulations.