Alex knew a few recipes for a pill similar to what he had made. He also knew that someone had to have come up with a recipe using almost all the same ingredients as he had too.
So this pill was not something unique. If not for the lack of ingredients, he would've even just used those pre-existing recipes. Only, he had to make do with what he had.
However, just because the pill existed before didn't mean that they had ever been made to work in a place like his mind.
At Immortal Transcendent 1st realm, Alex's spiritual sense was about as strong as an early Divinity. A Divine Sense's quality made it hard to judge exactly, but if pure mental strength were to be counted, he was no weaker than a Divine Creation 3rd realm cultivator.
And that was not including the fact that whatever he had done during the missing 50 years had improved the amount of his spiritual sea by more than twice.
That was to say that Alex had strong spiritual energy, and he had a lot of it.
