सप्तकोटि महामन्त्राश्र्चित्तविभ्रमकारकाः ।
एक एव परो मन्त्रः श्रीरामेत्यक्षरद्वयम् ॥
There are various 7 crores of so called mahamantras which would only lead your mind to illusion. Only the supreme two letter Divine Name Rama Nama would grant liberation.
Please check these: Excerpts from a discourse by our Sri Sri Muralidhara Swamiji