Hi,
I am looking for a fic that Kagome was in a battle and she charged the battlefield with reiki. So when her opponent stepped in the spot the reiki colum shot up and burned her opponent.
That is pretty much I remember. The story most likely to be MA and completed.
Thanks.

Giving Back by Sahrea (can't spell tonight) Rated MA, has something like that. Though it's in a challenge ring and she only does it near the end of the fighting.

Reserve Untapped by SilverEyedHyuuga
Years of battling Naraku have kindled Kagome's formerly feeble reiki into a considerable force. Now that the spider demon has been defeated, she has taken it upon herself to train and maintain her power. A certain daiyoukai cannot help but be intrigued by the blossoming of her gifts, and when their chance encounters begin to become not so coincidental anymore, he, against his better judgement and opinion of humans, begins to recognize her for the formidable priestess she has become. When Sesshoumaru joins forces with Kagome against a deadly new enemy--the powers of which they have never encountered before--he comes to respect her more and more as not just a mere miko, but as his equal.
Rating: MA, Universe: Canon, Status: Complete, Category: Chapter Stories, Chapters: 25

The scene you described is in chapter 24.

Thank you so much, It is "Reserve Untapped" rated MA
I will make sure to fav it this time.

You’re welcome.