[Bonus thanks to SongfulSalt. And when I do I'm going to do what Spain did to Argentina]
The Sage Heaven was the Heaven of Wisdom. To pin down their abilities was extremely difficult as they had the widest variability. Though Hell Ancestor Tera had been a Hell Creator, Hell Rune Creators weren't even necessarily the majority of their Heaven.
They just so happened to send one this time.
But… there was one unique Profession that the Sage Heaven did have. They called them the Decoders, Rune Masters capable of unwinding and dismantling any formation set before them.
They were the worst sort of enemy to have, because one moment a formation that had protected your Clan or Sect for countless generations would be standing tall and proud…
And in the next moment you would find it crumbling before your eyes.
