Defeating this oversized Whopperflower is mostly a matter of not getting distracted, and some small multitasking.
The Fellflower begins as a giant with a Cryo-infused shield. The primary way to tear this shield down is by breaking the fruits the Whopperflower sends at you, but elemental reactions like Melt still have some effect. For reasons I'll touch on in a moment, you'll likely want to take advantage of standard reactions.
As the Fellflower's shield takes damage, it will release Arcane Essence that will restore the shield unless you pick up the Essence yourself. Doing so will reduce your HP over time - each Essence is effectively a Rifthound's Corrosion stack applied only to the active party member. This can add up significantly over the course of the first phase of the fight, so watch your health and switch characters to transfer the health loss when necessary.
The Fellflower has three Arcane Fruits it uses for combat assistance. All the Fruits can be destroyed and deal massive damage to the Fellflower's shield when this happens, so long as the fruits can collide with the Fellflower (Geo constructs might disrupt a Fruit's path). All attacks seem to do the same damage to each fruit regardless of power, so use your swiftest attacks on them.
The first Arcane Fruit will appear above you and attempt to smash down into you three times in a row; in doing so, however, it puts itself directly in range of catalyst normal attacks that can destroy it easily. The second Fruit shoots long-ranged projectiles at you that you need to evade, but also gets destroyed by two attacks; either hit this one with basic bow attacks, or get in range for catalyst strikes to do the job. The third Fruit is the most troublesome, as it will start spawning Large Cryo slimes; these slimes must be killed off manually, and aren't affected by the Fruit's destruction. If you've done enough damage to the Fellflower's shield with elemental reactions, however, you can bring down the shield without ever spawning the third Fruit, saving you a lot of potential headache that juggling the slimes might bring (especially since the targeting system might go dumb and prioritize the Fellflower instead of the slimes regardless of attack range).
Alongside its assistants, the Fellflower can also fire direct attacks. It may fire up to five triple shots of rolling snowballs that small dodges to the side will handle (compare them to Andrius' wind cutters). It can also lob up to five snowballs that smash a wide area; you'll likely need to run out of the way, so manage your stamina around this move. It may also perform a circular melee sweep if you get too close.
With its shield gone, the Fellflower will shrink to a manageable size. It's still more resilient than most Whopperflowers like this: attacks that would send standard Whopperflowers flying will merely stagger the Fellflower. You can use this to your advantage if you have attacks with high hitstun that can disrupt the Fellflower's moves, and the fact that the Fellflower is sturdy means you can score constant bow headshots without any worry of the target reeling backwards.
The Fellflower's attacks in the second phase aren't too bothersome, though having a little distance helps substantially with evasion. The Fellflower can still lob snowballs, but its maximum shot count is reduced to three. It may also use the Whopperflower's ice barrage attack without the need to charge up first - backing away a bit will help avoid the shots (running around the Fellflower won't help, as it can turn as fast as necessary to aim at you). When the Fellflower buries for movement, it will always try to erupt up from where you're standing - be sure to move out of the way. Lastly, the Fellflower retains its melee sweep attack, which is difficult to avoid in melee range without a well-timed dash. Attempt to interrupt attacks with your own strikes as you see fit, though be wary that they might not always cause a stagger - in the case of moves like the melee sweep, the results could be painful.
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