[4K] Shadow of the Colossus π Hydrus Eel Fish 7th Boss Fight PS4 Pro Remastered Remake Guide
4Hydrus is the nickname given to the seventh colossus. Resembling an electric eel and a catfish, this colossus swims in a giant, murky lake at quadrant D1.
Head north from the shrine across the land bridge. From here, there are two ways of getting to the lake. The most direct path is to proceed as if traveling to Gaius, but to continue on to the Stone Arch Gorge (quadrant D2), then head north to the lake. It is easy to get lost this way, however, as there aren't too many opportunities to get help from the sword's light in the dark canyons. The easier, but slightly longer way is just to go straight north to quadrant F1, then go east through the Dried Marsh (quadrant E1). The entrance to the lake will be in plain view, and the sword can be used anytime. There is a stone path leading out to around the middle of the lake, where there will be a pillar with a spiral walkway wound around it. The player can use this walkway to reach the lake, or they could just dive in. Either way, Agro will have to watch from where she is.
Hydrus will be swimming deep underwater when Wander dives in. There is no special way of luring it up; just swim around above it and eventually it will make a pass at Wander. When it does, the player will have to grab on, but doing so isn't easy. The colossus is protected by three, giant, electric spikes protruding from its back, which activate a sphere of highly-damaging electricity when submerged. The only safe spot is the area of fur at the end of its tail.
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Once Wander's been dragged through the water, the colossus will swim around at the surface of the lake, going in and out of the water to try and dislodge Wander with its electrical spikes. The sword will show the player a small place where they can stab at the base of each spike to disable them, but be very careful; this requires a near-fully charged stab at least, and the electricity will deal a massive amount of damage to Wander if he's too slow. One may not have time to disable all three spikes before Hydrus dives back underwater, which will eventually force Wander off. The colossus will soon resurface, however, and Wander doesn't have to disable any spikes he took out previously. When one finally makes their way to its head, they'll find its only major sigil. Hydrus will continuously bob its head up and down in the water, so time stabs thoughtfully, as the colossus cannot be stabbed when submerged.
Time Attack times in Original and PS3 versions (Normal, Hard): 12:00, 8:00
Time Attack times in PS4 Remaster (Normal, Hard): 9:00, 7:30
Weakspots
Location Percentage of health
Normal Hard
On its head 100%
Behind each spine (3) Kills electric organs
Tips and tricks
It is possible to run past the first two spikes, but the player must be extremely quick. With the small health bar given in Time Attack, the damage incurred from messing up will nearly kill the player. The final spike must be taken out, as it protects the colossus' head.
There are are a few ways to know that Hydrus has submerged when on him. These are all helpful in time attack, as the player can then just quickly let go and repeat the process of getting on him.
The first and easiest one is the music changing. If Hydrus goes underwater while on him and βSilenceβ starts playing, that means he wonβt come back up.
The second one is the depth. When submerging, Hydrus will go really deep, and most of his will go underwater.
The final one is time, as when parts of Hydrus go underwater when he tries to shake Wander off, it will take a few seconds for them to resurface. If most of his body doesnβt come back up in that time zone, it means he has submerged.
Music
After passing under the arch at the beginning of the bridge over the lake, "Lakeside" plays.
Once Wander hits the water and a small cutscene plays, "Silence" starts. If Wander falls from Hydrus after grabbing on, the track starts playing once more until he grabs on again.
"In Awe of the Power" plays once Wander grabs onto Hydrus and continues (so long as Wander remains on Hydrus) until the end of the fight.
Trivia
Hydrus is one of only two colossi that are fought in a body of water; the other water-dwelling colossus is Pelagia.
Hydrus is the first of three limbless, serpentine colossi the player faces over the course of the game, the other two being Dirge and Phalanx.
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