Since it was Ajax's first time hearing about the 'Space collapse', he asked Prophis about what they have to do in order to stop it.
'There are only two ways.'
After thinking for a moment, Prophis replied to Ajax as he continued, "One, the source of the space collapse, that is the devourer eagle king should be killed."
'What?'
Ajax raised his brows for a moment and as he asked, 'Continue.'
Since killing the devourer eagle king was out of option, Ajax asked for the second way.
The problem here is, because of the space collapse, the barrier of the secret realm would be destroyed which makes things difficult for Uncle Dralf as it was a safe house for the battle barbarians.
So, he wanted to stop the 'Space collapse'; however, if it really costs him to sacrifice a devourer eagle king, then he would let the Space collapse happen rather than sacrificing his king realm spirit beast.