Heart of Gaia
Ignore the temptation to interact with the shiny thing on the wall for now and instead climb up the wall on the right. Here Zeus' Eagle is up for grabs, but can't be used until after you beat the game once. Now pull the giant column of rock from its spot and drag it to other side, where it will fit in another crevice. Flip the column 180-degrees by using the right Analog Stick and slide it into the crevice to complete the path. Scale the wall, leap to the grapple point, press R1, and swing across to the far wall.
The next area serves as a playground in which Kratos can practice the Battering Ram as directed by the on-screen prompt. Afterwards, follow this path to the end and begin the long ascent. The God of the Sea, Poseidon, awaits Kratos at the top and almost immediately engages him in battle.
Boss Battle: Poseidon
Clearly, Poseidon is as self-imposing as ever. In fact, one would normally think the battle be unfair, but as Kratos' track record has proven otherwise not even gods can phase this angry Spartan. Just as with the previous encounters with Poseidon's incarnations, the battle will advance in three segments. In the initial segment, Poseidon's giant claws grip the sides of the area and should be the focus of Kratos' unrelenting fury. As you wail away on the claws, watch Poseidon for any tell-tale signs of an imminent attack, usually indicated by dramatic movements on his part and crackling blue energy gathering under Kratos' feet. When the latter happens, roll away to avoid being seared by the ensuing lightning.
Eventually, the claws are pried loose from Gaia's head after a good deal of thrashing, at which point the location of the battle positions Kratos closer to Poseidon himself. In this up and personal perspective, Kratos' attacks easily reach Poseidon, but expect him to retaliate in kind with jabs from both his trident and fist. Poseidon also unleashes a more deadly attack, in which he thrusts his trident into the ground three times, each time emitting a burst of electricity. Roll toward the rear of the area and back to the front to evade this attack.
Wear down the Greek deity enough and the QTE prompt appears overhead. Move to the back and clamber up the vines to reach it. Despite Kratos' punishment, Poseidon is not quite done yet and stands firm against the prevailing Spartan in a segment that somewhat mirrors the first, except Poseidon casts a highly damaging lightning attack that slowly works its way toward the back of the screen. Unleash an all-out attack on the claws to minimize the number of times Poseidon casts this move and off the God of the Sea for good.
After following the button sequence, the final prompt asks you to press L3 and R3, which means pressing down on the Analog Sticks.
