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MistGrave
Boon+ Atk Bane - Spd

Skill Set

Hero Build Overview/Explanation

Weapon: Dark Royal Spear, Lull Atk/Def 3. Pretty self explanatory if you ask me, but to be clear this is his best refine if you intend for Berkut to fill more than just a res tank role. The +2 MT over Berkut's Lance+ offsets the -2 res penalty for not using the latter and the additional Atk/Def/Spd +5 on enemy phase from DRS just solidifies its superiority. Offensively, it sets up Berkut's enemy phase role really well and, critically, it clearly defines what he should be doing on the battlefield. The refine gives him usability on player phase, which is really needed in this particular build.

Assist: Reposition makes it easier for you to keep Berkut in front if his allies have already acted. Pivot can also keep him in front, so pick and choose where your fodder allows.

Special: In this case, Noontime is going to be keeping him alive for longer. As this build is for a Berkut who's fighting on both phases, he's going to need to be surviving every encounter with a reasonable amount of HP to keep Quick Riposte 3 active. Alternatively, feel free to swap Noontime out for another low-cooldown special like Moonbow if Berkut isn't the main fighter on your team. I say low-cooldown specifically, because Berkut wants to be activating specials often to guarantee his kills- it can be dangerous to leave him out on enemy phase directly after player phase too many times against enemies that have been charging their own specials and likely have follow-up attacks to destroy him with. His spd is still terrible, after all.

A Skill: Distant counter is mainly here to make good use of his respectable res stat mainly on enemy phase, though his high def will also help against pesky archers. It's also relatively easy to find on your fodder. Alternatively, consider usage of Distant Ward, though I suspect most of us only have that skill on B!Edelgard and aren't exactly ready to part with a monster like her.

B Skill: Lull Atk/Def 3 (I know it says Lull Atk/Spd 3 but there wasn't an option for that) is a strong option for his B skill as it's essentially doubling the effect of his lance and, as such, crushes enemies that rely too heavily on combat buffs and situational advantages. Alternatively, placing Quick Riposte 3 here and dropping a different seal on Berkut is a good idea too.

C Skill: Atk Smoke 3 is a very strong option for a front-liner Berkut as it helps him stay alive much longer. Making use of both his C skill and Noontime will keep your Berkut alive and well enough to use Quick Riposte 3 to its full effect. Alternatively, make use of one of my favourite skills in the whole game, Atk/Def Menace. It's essentially a stronger version of Atk Smoke 3 with a wider range, but the price is not low in the slightest. Female F!Morgan has three very powerful skills and foddering away Atk/Def Menace is essentially throwing the other two away. If your dedication to Berkut goes as far as mine, I absolutely respect it.

Seal: Quick Riposte 3 is, as many people have noted in their own builds for Berkut, almost a necessity. His awful spd stat will almost guarantee that he's getting doubled and, while Noontime will alleviate this issue on enemy phase because of his +5 to all stats boost, it doesn't solve the problem on player phase. That's why I suggest it here, but there's no reason you can't use another seal that fits your team's needs more than his own. Fair warning though, not replacing your B skill with Quick Riposte 3 does come at a steep price on player phase.

IVs: Atk+ Spd-. Really, what's the harm in making a dump stat worse and the critical element of this build better?