Time passed slowly.
Slowly but surely, Nathan was being integrated into the group, though they still kept certain secrets from him.
In the meantime, the trio started getting certain things done.
First of all, Gideon decided to remove the remaining traces of lower bloodline from Lisk's body.
It was a strange and pretty dangerous process that caused Nathan to be near death a few times because they literally had to drain his blood and use it to flush out Lisk's.
After that, Gideon created three new poisons. Namely, parasitic which allowed him to pretty much take over people's brains and control them, siphoning poison which drained someone of their astral energy, and explosion poison which caused the blood of the opponent to become very volatile and explode.
After that, the four of them trained regularly, and according to Gideon, they were waiting for an opportunity, and after another two months, this opportunity finally came.