Can you focus light on the Lakshmana Rekha power possessed by Lakshmana in the Ramayana?
Is there a Mythological story behind Lakshmana possessing this power ?
Had somebody crossed the Lakshmana Rekha, What would had been the consequences which included the mighty Ravana?
There is no mythological story behind Lakshmana possessing any special power. He just prayed to the devatas after drawing the line and establishing Sitaji in their care. He said that the consequences of crossing the line would be that the said person’s head would get destroyed and make powder i.e. burn and become ash.
The story as described in the Telugu Ranganatha Ramayana:
After this, Lakshamana drew seven lines around the thatched hut and said, ”Oh mother, do not cross these lines and come outside. If anyone tries to cross these lines his head will become powder that very instant.” Then he prayed to Agni establishing Sitaji in his care, bowed down respectfully to Sitaji and left to find Ramaji.
-Ranganatha Ramayana Aranyakanda Chapter 18
The story is the same even in the Bengali Krittibas Ramayana with a minor variation on the number of lines, not specifically mentioning Agni and not mentioning the consequences:
Going out, Lakshmana drew a line all around and said no one shall enter the hut. He said, “Oh devatas, Raghunatha his Vishnu himself and his wife is Sita. Please keep her.”
-Sri Rama Panchali Aranya Kanda 32
The incident of Laxmana drawing a line around Sita (Laxmana Rekha) is very popular. However, it is not part of the original Ramayana. Valmiki never mentioned any such thing. Here I am quoting from Valmiki Ramayana.
Sita said very harsh words to Laxmana as he initially refused to go in search of Rama. Then Laxmana said -
I shall go where Kākuthstha is, may good betide thee, O thou the best of damsels! May the deities of the forest protect thee, O thou of expansive eyes! Many a bad omen appear before me. May I see thee again when I shall come back with Rāma." Being thus accosted by Lakshmana the daughter of Janaka replied weeping and being bathed in tears. "Without Rāma, O Lakshmana, I shall drink virulent poison, enter fire or dive into the Godaveri. I shall destroy this body either by hanging or by falling down from the top of a high object. I shall never be able to touch another man but Rāma." Speaking thus unto Lakshmana, Sitā, being enveloped with grief, weeping, struck her belly* with her hands. Seeing the daughter of Janaka of expansive eyes weep thus in pitiable accents, Lakshmana losing his attention began to console her. Afterwards the pure-hearted Lakshmana, having control over his senses, saluting Sitā with clasped palms and bending low a little proceeded where Rāma was, casting again and again his glance upon her as he went. - Valmiki Ramayana III.XLV
*(Properly it should be "struck her breast." But it has a special significance here, i.e.—she would not be satisfied until her belly be filled with all the Rākshasas slain.—Translator's note.)
This is the end of the chapter 45. So, as you see there is no Laxman Rekha, there can't be any magical power behind it. These are all later additions.
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