Although the ability in itself was powerful, in the hands of someone incapable, it wouldn't reach its full potential. The guides' experimentation would be all for naught if the chosen players couldn't utilize Amoris Versatilis properly.
For this reason, Luluwa made sure to select the players who could be of help to them.
The Guides themselves weren't able to wield Amoris Versatilis.
Only players were allowed to do so. The Guides were not the ones who created the ability. It was some being that event the Guides couldn't reach.
A being who could possibly be responsible for why the Obelisk existed.
Going back, the Guides were given instructions how to operate Amoris Versatilis. They had plans of religiously following the instruction.
So here they were now.
