SO MU RA TA HEN WER NI DRUM HRUN MU TRE MU TRE MU RA MU TRE MUTRE MU TRE MU YE MU YE HA RA MU TRÖ MU TRÖ WER RO MU TRÖ MU NI GYER TO YE KHYAB KAR RO TRÖ DAL HRI HRO WER NIWER RO SHU LAWER RO NA HU TAKA SHUD DO SHUD DO

(Translation) SO - represent radiant bright rays and lights of the 3 Bodies MU RA TA HEN - Tonpa Shenrab WER NI - Victory over disturbances DRUM - Mandalas and Pure Lights HRUN - Unchangeable stability MU TRE MU TRE - Body of Essential Nature and Dharmakaya MU RA - Combines MU TRE MUTRE and Tonpa Shenrab MU TRE MUTRE - The source of all the Buddha's wisdom MU YE MU YE - Shambhoga Kaya and the 5 Certainties HA RA - 5 Wisdoms MU TRÖ MU TRÖ - 5 Uncertainties of Nirmana Kaya WER RO - King of the 5 Paths MU TRÖ - Emanations giving countless Teachings to countless beings MU - The Absolute Truth of Essential Nature NI - Realization of the Ultimate Nature GYER TO - Realization of all phenomenal existence YE - 6 Realms of Beings KHYAB 100,000 Emanation Bodies of Tonpa Shenrab which manifest in each of the 6 Realms KAR RO - Rays and lights of Compassion radiating into all of the Realms TRÖ - Swastikasattvas DAL - Purification of obscurations HRI HRO - The development of Self-Aware Wisdom WER NIWER RO - Freedom from external, inner and secret disturbances SHU LAWER RO - Freedom from demons NA HU TAKA - All delusions SHUD DO SHUD DO - Blessing Wisdom Nectar which purifies all delusions

This is the 100 Syllable Mantra (of Bon). I'm not sure why the Phurpa group titled it as the “Fundamental Mantra.” It may have that title somewhere, but it is more commonly known as the 100 syllable mantra. It is usually said (100,000 times) as an atonement for evil deeds during Confession/Purification practice as part of Ngondro (the foundational practices of Tantra and Dzogchen)… In this use, the prayer isn't the prayer of confession itself, but as part of the purification for atonement. nuadu

SO MU YE TRO CHYUNG YE LAM TRI TRI TAR DAR
SAL BAR OE PAG RAM SO HA
SO MU RA TA HEN WER NE DRUM RHUN
MU TE MU TE MU RA MU TE
MU YE MU YE HA RA MU YE
MU TOE MU TOE WER RO MU TOE
MU NI GYER TO YE CHYAB KHAR RO
TOE DAL RHI RHO WER NI WER RO
SHU LA WER RO NA HU TA KA
SHU DO SHU DO DU SHU DO YA
SALE SALE TI SALE YA
SANG NEI SANG NEI SU SANG NEI YA
MU RA TA HAN TI TSE DUNG MU
HA HA DRUM DRUM HO HO LAM LAM HUNG HUNG
PE PE

(Translation)

Nampar Gyalwa, Nature of Truth Body, Dzogku, Tulku, Chyung Se
Drug Se, Seng Se, Zowo, Zema, Rucho and Tumpo
May we receive the illumination of their wisdom
I bow to the nature of the Victorious One, the palace of the Shenrab
With the three bodies, Nampar Yalwa Khangzang
Bon ku, Bon ku, Bon ku of Space
Dzog ku, Dzog ku, Dzog ku of wisdom
Tul ku, Tul ku, Tul ku of victory
May the Bon teacher give the illuminated view to the disciples
May the disciples attain the complete victory of knowledge
May we achieve victory from all sin, hindrance and obscuration
Purify and Purify, may we be purified of anger
Clear and Clear, may we be cleared of attachment
Clean and Clean, may we be cleaned of ignorance
By the grace of the wisdom of the One Thousand Shenrabs
May we attain the indestructible result of being born into the palace of purity for the benefit of all beings
Wrathful Wrathful