(The author is a college student, so updates won't be very frequent, and there may occasionally be temporary hiatuses. Please understand.)
Fuse me with Kiana, Fusion Summon! Appear, Knight of Seals!
Use four-star Mei to tune me, Synchro Summon! Be born, Blade of the Thunder Empress!
Stack my four-star self with the equally four-star Bronya, Xyz Summon! Show yourself, Rabbit of the Otherworld!
"Can you transform without saying so much?" The Core Three had finally had enough.
"Arrow, confirmed... Ahem, everyone, get ready to combine." Seeing the three of them preparing to Herrscher-fy, Xingguo immediately backed down.
(Reader advisory: This story mainly follows the Honkai Impact 3rd timeline, with occasional crossovers with other worlds. If you're not a fan of multiple series, read with caution.)