A Mantrik or mantric is someone who specializes in practicing mantra

Mantra

A mantra is a sound, syllable, word, or group of words that is considered capable of "creating transformation"...

. In India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

 the word mantrik & similar names are synonymous with magician in different languages. Generally a mantrik is supposed to derive his powers from the use of charms, mantras, spells and other methods. A Hindu mantrik is known to worship Kali

Kali

' , also known as ' , is the Hindu goddess associated with power, shakti. The name Kali comes from kāla, which means black, time, death, lord of death, Shiva. Kali means "the black one". Since Shiva is called Kāla - the eternal time, Kālī, his consort, also means "Time" or "Death" . Hence, Kāli is...

 and is often mentioned in the same breath as tantric

Tantra

Tantra , anglicised tantricism or tantrism or tantram, is the name scholars give to an inter-religious spiritual movement that arose in medieval India, expressed in scriptures ....

, though there are subtle differences.