Nioh

Given for beating the boss Umibozu.
I'll describe the tactics a little.
The first mandatory action before moving on to the boss is to light all three fires. I will write about this deed in the tooltip for the “Keeper of the Flame” trophy. Be sure to open the second altar; running from it to the boss is much more convenient than from the other two. You can get to it through the roof (the place where the ascent to the roof is laid out with boards, on the boards themselves there is a man with a spear and in front of them is a man clad in armor with an axe), by climbing up it and going back along it a little.
The boss battle itself isn't particularly difficult. I advise you to take a long-range weapon.
The beginning of the battle - Umibozu is in the water and spits all sorts of rubbish, occasionally stretching out his arms. It's easy to dodge the rubbish - don't stand still and move left and right around the arena. It’s also not difficult to dodge the beam, but if you were left alive under previous spitting and throwing pieces of wood, then the beam will finish you off in one go. When he stretches out his arms, turn off the sight and move parallel to the boss so that he doesn’t get hit and smack across the arena. After this, you can try to slash at the glowing cores in the tentacles. When the boss crawls to the edges of the arena, you can periodically run up and poke him with a stick between his attacks. Throughout the entire boss fight, there was never any space between him and the edge to fall into. But it’s better to use a spear so as not to tempt fate. Here his beam will play against the boss already. Because after using it, a yellow spot remains on the boss for a short time, open to attacks. Dodge the beam and run to hit it in its weak spot.
When the boss has half his life left, he will crawl ashore and the tactics of the battle with him will change. Now we need to make him jump. It's not difficult to do this. Determine where his front is (he usually leans there) and run behind his back. In most cases, the boss will jump up and squish onto the arena. Keep your distance, the jump hurts. At the moment when he is flattened, we run up and give him 2-3 hits from the top stance, and then run away from him, because he gets up from this position, causing a lot of damage and reaching a decent distance.
The boss will still continue to shoot water or other joys at you, hit you with tentacles or flop down on top (from this you need to run around the boss), but if you constantly force him to jump, he will not have enough time for the rest.

But if you don’t light the fires, three small snot, koumibozu, will crawl to help the boss, which will definitely not allow you to concentrate on him and you will most likely die trying to dodge them and the boss’s spitting. There is a title in the game for completing the boss without lighting fires. Bonfires can also be used to light weapons in them. However, if you do this in the first phase of the battle, in the second phase the same koumibozu (snot) will appear from there, because after the weapon is lit, the fire is extinguished.

Oh yes, the boss door is not so far from the beginning of the location. Bonfires are lit on the boss's territory. And in front of her lies a corpse, whose memories contain a warning “not to go further.” The door to him must be opened. So heed the warning and don't go there until you have lit all three fires.

and in addition to everything that was said above, use fire weapons or fire amulets, two katanas and the ability from the top stance (when using a block, madly press triangle) turned out to be absolutely ideal for me, with a total of 5 combinations and the boss is ready (a small clarification - I went through this tactic twilight version of the task, so on a regular mission I think it will burst in a couple of combinations).