The end game of Genshin Impact largely revolves around spending resin to take on world bosses and clear domain challenges. These fights grant amazing rewards like rare artifacts and ascension materials for weapons and adventurers, but obviously only if you're up for the challenge.
Of all the world bosses in Genshin Impact, by far the most difficult is Oceanid. This hydro boss spawns waves of enemies and unleashes powerful elemental explosions, all while your field of battle submerges underwater. It's intense, and--at times--downright brutal, but if you have any hydro adventurers like Mona, Tartaglia (Childe), Xinqiu, or Barbara, you need to defeat this boss to ascend them. Read on below for some tips on how to make the Oceanid fight a little more manageable.