The moment he heard Minos' order, Wovar was ready and did what he had to, consuming the parasite he had nurtured since the aftermath of the fight against the Armhands General, who had tried to kill Minos decades ago.
Back then, he was only a level 112 Sovereign. Now he was a level 116 Supreme, having, with Minos' help, achieved those four advancements.
As soon as he sacrificed his Flashdrain parasite, Wovar knew he might risk his life, because of the weakened state he would be in afterwards, or because of the dangers of no longer being able to use this trump card in the future. However, the entire group had agreed even before arriving in Uzira that they would sacrifice their parasites as needed.
It would be more worthwhile to sacrifice their Flashdrains than to accept deaths among them!