What are the benefits of chanting the Chamunda mantra
aim hrim klim ....
whether this can be used as a protector mantra from evil effects or give response to those who do bad things?
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The mantra is well known as the Nava-varna (nine-letter) mantra of Devi. It is one of the most powerful and widely used mantra.
The Devi Atharvasirsa Upanishad discusses it and according to which this mantra is a giver of bhoga (worldly pleasure), bliss and also final liberation. That is it bestows the chatur varga phalas.
She is Satva, Rajas and Tamas. She is Brahma, Vishnu and Rudra. She is Prajapati, Indra and Manu. She is the planets, stars and constellations. She is various measures of Time. She is destroyer of sins, giver of both enjoyment and Moksha, without end, giving victory over distractions of Samsara, pure, worth taking refuge, giver of peace, peace personified, we pray to Her.
viyadīkārasaṃyuktaṃ vītihotrasamanvitam ।
ardhendulasitaṃ devyā bījaṃ sarvārthasādhakam ॥18॥
evamekākṣaraṃ brahma yatayaḥ śuddhacetasaḥ
dhyāyanti paramānandamayā jñānāmburāśayaḥ ॥19॥
Akash means ha, with ī syllable, Agni ra, aṃ is the Bijamantra for the Goddess (so hrīṃ is formed). This mantra is able to satisfy all desires. Those Yogis whose mind is pure, meditate on this one syllable Brahma, they are having extreme happiness and like an ocean of knowledge.
vāṅmāyā brahmasūstasmāt ṣaṣṭhaṃ vaktrasamanvitam suryo
nārāyaṇena saṃmiśro vāyuścādharayuk tataḥ vicce
navārṇako ̕rṇaḥ syānmahadānandadāyakaḥ ॥20॥
Vak aiṃ, Maya hrīṃ, Brahma or Kama klīṃ, the sixth consonant ca with Vaktra ā, Surya ma, the right ear u, and Bindu aṃ, the third from ṭ (ḍ), with Narayana ā, Vayu ya, with lips ai and at the end vicce (so aiṃ hrīṃ klīṃ chamunḍāye vicce is formed). This navarna (nine-lettered) mantra gives pleasure, bliss, and nearness the meditator to Brahman.
As @Rickross provided answer to 1 question, I am providing answer to the 2nd question - "whether this can be used as a protector mantra from evil effects or give response to those who do bad things?".
The following is an excerpt from 12th Chapter of Devi Maahatmyam or Durga Saptasathi, which contains the chAmunda mantra.
Those who read or hear the eulogies about Maha Devi, particularly on Ashtami, Navami or Chaturdashi days would qualify human beings for diminishing sins, removal of poverty, as also safe-guarding against enemies, robbers, fire and water hazards, weapons, diseases, family unrest and general discontentment.
Sanskrit text of 12th Chapter of Devi Maahatmyam or Durga Saptasathi can be viewed at Page 88 (5 and 6 slokas) can be viewed at the following link.