Alliance Negotiation

Due to the fact that he got involved with Kaiser which is one of the Lunirich Gods who is able to forcefully essentially kidnap him for days, coupled with the attack by the cursed creatures, Rex knows that he can't keep going like this.

Maybe he alone would be able to survive, but the others are not cut for this kind of life.

Although he's an invincible entity in this current time with a handful that can match his strength, the others are not that strong compared to him. Out of the four pack members, Flunra is still probably the strongest due to his ancient runic power.

It's not he's the strongest in terms of raw strength, but his power makes him a formidable enemy.