Sifrona wanted at least one more demon beast leader to lend her a helping hand.
Her goal wasn't to win against Eren in a deathly match but to force him to retreat.
She could then report her findings to her bosses and let them take care of this nascent Demon Emperor.
'Alright. I'm in,' replied one of the demon beast leaders who finally relented after hearing Sifrona's offerings. This demon beast leader was named Kerim, evolved from a dire-wolf-type demon beast.
Kerim had razor-sharp claws and feral features. His muscular form was adorned with jagged spikes and talons, and his eyes gleamed with a predatory light.
The agreement between Kerim and Sifrona was reached within a fraction of a moment.
When she received Kerim's approval, she couldn't help smiling at Eren before speaking in a challenging tone.