Yuna Caibella.
After the departure of Princess Vanya, Logan, and Alice, along with the 4th general of Vensalor, Aura Vamoira, the remaining crew members returned to Deadbay, according to Elincia's initial order. In that human kingdom, Beris, they were more needed than what they could do by returning to Vensalor. Zoron Vamoira, the 1st general of Vensalor, has also informed them that reinforcement troops will soon come to Beris.
It seemed perilous to sail the sea after the sudden attack of high-tier monsters several times in the last couple of days. Especially if there weren't enough Tier 4 adventurers on board. Only two people, including Yuna, are in Tier 4 they have right now.