kalA-s are
Krishna Avatara, with all 16 Kalas (Poorna Avatara):
1) Anna Maya (with cereals)
2) Pranamaya (with breath)
3) Mano Maya (with mind)
4) Vigyanamaya (with knowledge)
5) Anandamaya (with joy)
6) Atishayini (With Peace)
7) Viparinabhini (With Love)
8) Sankramini (With Creator)
9) Prabhavi (Kartum Akartum, that is able to do seemingly impossible tasks)
10) Kunthini (meaning ?)
11) Vikasini (विकासिन् vikasin adj. great )
12) Maryadini (highly respected or with etiquette)
13) Sanhaladini (संह्लादिन् saMhlAdin adj. cheering, a source of happiness)
14) Ahladini (आह्लादिन् AhlAdin adj. causing joy or delight)
15) Paripurna (complete knowledge of all forms of awakening)
16) Swarupavasthitha (swarup + awasthith = established in his real true self)
source
RAma had 14 kalA-s. i.e. Vishnu descended as RAmavatAra with 14 kalA-s. KalA-s are siddhis in the language of Yogis. This is because of the boon received by RAvaNa that no God could kill him. Only Human would be able to kill him. If Sri RAma had all 16 kalA-s then he would not remain human (maryAdA puruShSottama), as with 16 kalA-s one has ascended to the highest plane (even from yoga point of view).
In general, a human can master or achieve 5 siddhis, some may achieve 8 or 9 siddhis, but not any further. Only humans with deva-anSa or some avatars can master more than 9 kalA-s.
We have an example of Maha avatar Babaji (Mahavtar Babaji), who is great Kriya Yogi, who has conquered death and has transformed his entire body into light. In one book, written by Neelkanthan titled 'The Voice of Babaji', Babaji's words are quoted as saying, Shiva never made me 17 and so you will not be 52'.
After saying this Babaji killed forehead of Neelkanthan, who was very sick and it is said that his body did not aged any further. Babaji's body stopped aging after 16 years, due to his intense tapas. Some yogis have control over panch mahAbhuta-s. Some siddhas can change their physical form, as in case of some siddhas who reside in AruNAchala Parvata, where Sri Ramana Maharshi lived most of his years. They have master many siddis and Sri Ramana Maharshi said that there are saints, present today, who can give boons or curse, and roam hidden in holy mountain. They have become Shiva-SvarUpa and are even capable of giving vardAna.
16 kalA-s may also be connected with 16 rays of light. I do not have much info, hence I cannot explain you more.
In case of Rama and Krishna, some say that it is a process of evolution, if you compare all incarnations in chronological order, with Krishna as the last. don't know about later avatars. This order is true from both spiritual evaluation and mastery and in scientific evaluation, like fish avatar, boar avatar, then human, etc.
Jai Shri Rama
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