Reinforcements.

He had taught the demigods of the Kunut race how to build the portal and it was very easy for them to learn it.

As demigods their mental prowess is outstanding and as librarians, even as mortals, their ability to learn is exceptional. So it was easy for them to learn it.

But learning and doing are two different things. Despite knowing what to do, it had taken them more than a hundred years to finally succeed in creating the portal.

The delay was because they couldn't manipulate blood precisely enough to create the blood portal. Even when they succeeded, it was due to luck and chance. And the portal crushed him and nearly killed him when he used it.

But that won't happen this time around. This time around, he will create a stable and strong blood portal with a large channel that can not only summon a primordial vampire safely, but it can also summon many primordial vampires too.