Greeting instructors! First off thank you for your selfless service in this forum! You guys are awesome!

In these studies one notices a peculiar detail, there are so many mantras!

Each mantra works for a specific purpose, and each one is recommended to be focused on by itself! The mantra one is focusing on right now is Om Masi Padme Um.
A meaning that's been brought out is "The Jewel is in the Lotus".

However, there's a mantra that one hears that recites as follows; Om Aim Hrim Klim Chamundaye Vichi...

And supposedly this mantra is to invoke Mother Durga in case of emergency or better said against the ego's influence in moments of desperation, for Chamunda is our Divine Mother in her wrathful aspect.

Even if this mantra is not in Samael's teachings does it still contain effeciency?

There are so many mantras that there is doubt in their effectiveness.
One is afraid to waste their time. That is the problem. Is there a way to eliminate this doubt and have faith on a mantra? It is really difficult to just rely on a single one when there are so many...and one wishes to eliminate their ego as soon as possible.

Thank you instructors for all that you do. One hopes you all the best thank you very much again! Merry Nativity!