Story related, can’t be missed.
*** Spoiler - click to reveal *** Thanatos is the God of Death and father of Erinys. He serves as the game's final boss. This fight takes part in 5 phases.
Boss Fight - Thanatos attacks:
Sword Combo: Standard 3 hit combo attack.
Flying Stagger Crash: Jumps of cliff to stun the brothers
Grabbing: Will grab whoever closest to him when stunned.
Sword Charge: Single swing from his sword.
Gigantic Winged Beast: Transformation into a gigantic winged beast.
Energy Blasts: Shoots a focused blast of energy.
Arm Swipe: Swipes his arm across the field.
Shockwave: Stabs sword into the ground and creates a shockwave with it.
Aerial Combos: Standard aerial combo attacks.
Aerial Crash: Crashes down upon you while flying.
Fist Crash: Crashes his fist onto the ground to crush you.
Phase 1:
During this phase, Thanatos will be alternating between both Kratos and Deimos. I suggest that you attack him with your Blades of Athena normal combos empowered by your fire abilities. He'll attack you with his sword attacks which can easily be parried or blocked with the L1 Button button. Whenever he flies onto the cliff, you should always have Deimos throw his spear at him by pressing the D-pad Down button. Thantos will always come crashing down off the cliff to stun both the brothers and will grab either Kratos or Deimos depending on whoever is closer to him. Once he grabs either of the brothers, you should assist each other until he releases them from his grip. Continue attacking him and blocking his attacks until you eventually throw him off the cliff.
Phase 2:
During this phase, Thanatos will transform into a gigantic winged beast and will now begin to shoot Energy Blasts at you which must be reflected back at him. Once you reflected the Energy Blast back, you'll have to attack his left arm with your Thera's Bane fire power. You'll scatter his armor on his left armor little by little. Once he recovers, he'll swipe his arm across the field which you can dodge by double jumping away from it. Continue reflecting and breaking his armor until he eventually returns back to his human form.
Phase 3:
During this phase, Thanatos has now become more aggressive with his attacks and will now perform aerial moves as well. All of his attacks can still be blocked, dodged, and parried, except for his aerial attack when he slams down on you which has to be dodged only. With that being said, the rest of this phase is the exact same as Phase 1. In other words simply continue to attack him until he eventually transforms into his winged form.
Phase 4:
During this phase, you'll be back to reflect his Energy Blast attacks. Once he's stunned you can attack his arm with your Blades of Athena. Again, once he recovers he'll swipe his arm across the field and will now begin to crash his fist onto the ground to crush you. Simply continue with the attacking, reflect and jumping out of the way of his attacks until you're prompted to press the Circle Button button against him and then complete the following QTEs that follow afterwards.
Phase 5:
This is the final phase of the fight were Kratos is fueled with the fire powers of rage. There's nothing special to say here, since Kratos is now overpowered, but you'll still need to attack and dodge his attacks. Thanato will do the same attacks that have already be mention before. So you should be fine. When you finally weaken him and the prompted Circle Button button appears, enter the mini game and continue to complete any other QTE to finally kill Thanatos.
All credit goes to orginal authors at playstationtrophies.org, and this is merely updating truetrophy fans with these guides.
http://www.playstationtrophies.org/game/god-of-war-ghost-of-...