Oh, this is such a specific and fantastic niche ask. I've been deep in 'Arcane' fic for ages now, and Sevika & Ambessa is a pairing with so much potential that barely gets tapped. The power dynamic alone—the Noxian warlord and the Zaunite enforcer—is a goldmine for tension. I think the real standouts are the ones that lean into their shared pragmatism, that cold, ruthless edge they both possess, but explore the tiny cracks in that armor.
My absolute top rec would be 'Terms of Surrender' over on Ao3. It's a post-canon, politically-charged slow burn where Ambessa comes to Zaun to... negotiate. It’s all about logistics, territory, and unspoken threats, with this incredible simmering tension. The author nails their voices; Sevika's dry, cynical internal monologue contrasting with Ambessa's brutal, direct exterior. The first time Sevika pours her a drink and Ambessa just stares at her, assessing... chills.
There's also 'The Dregs and the Dread' which is an alternate universe where Sevika ends up as part of Ambessa's personal guard on a campaign. The world-building is insane, really fleshing out Noxian military culture, and their relationship develops through shared battles and exhaustion. It feels earned, not romanticized. I reread it whenever I want that gritty, tactical feel.
Honestly, the tag is still pretty small, so sorting by kudos or bookmarks on Ao3 is your best bet. Just be prepared to wade through some that turn them into soft domestic fluff, which... feels wildly out of character to me. The appeal is in the sharp edges.