You will be in search of the Irish: leipreachán's pot of gold at the end of the rainbow. The Leprechaun is a type of "Fairy" in Irish mythology, usually taking the form of an old man, clad in a red or green coat, who enjoys partaking in mischief. Your first stop will be at the posted coordinates to find the first clue.
Like other fairy creatures, leprechauns have been linked to the Tuatha Dé Danann of Irish mythology. If ever captured by a human, the Leprechaun has the magical power to grant three wishes in exchange for their release. Popular depiction shows the Leprechaun as being no taller than a small child. In the (English: Adventure of Fergus son of Léti), Fergus mac Léti, King of Ulster, falls asleep on the beach and wakes to find himself being dragged into the sea by three lúchorpáins. He captures his abductors, who grant him three wishes in exchange for release.
The leprechaun is said to be a solitary creature, whose principal occupation is making and mending shoes, and who enjoys practical jokes. According to William Butler Yeats, the great wealth of these fairies comes from the "treasure-crocks, buried of old in war-time", which they have uncovered and appropriated. According to McAnally the leprechaun is the son of an "evil spirit" and a "degenerate fairy" and is "not wholly good nor wholly evil".

"Ye be toil'in on thah quest fer me gold. Beware, oh ye foolish human nay, take naht yer journey lightly. Ye twill be tested ah mind, body and indeed may break yer spirit along thah way."
"Ye be led by thah colours ah thah tuar ceatha, which ye twill receive froom me seven brothers, Rionachin, Yseult, Glendon, Vltan, Bradan, Oisin an Iollan, fear greatly thier blarney! At thah end ah thah tuar ceatha, if ye cun catch me, ye twill receive yer reward. "
"Ye should be spry, keener thun I an ta thah lucky FTF, STF an TTF grant ye by three wishes, un thee likeness of three items ah great wealth. All thah come after ye cun share thah other treasure should ye have someth'an ah equal ere greatah value ta exchange."
"Ye twill travel ta each colour an follow me seven brother’s clues ta thah next, an follow thah prompts ah each stop. Yer first stop tis thah search fer dath dhuit an ghrá. When ya get ta me brother Vitan, at step 4, ye must sign his log to go any further"
"UPOON THAH FOOLISH HUMAN THA GIVES UP THAH LOCATION AH ME GOLD, ME BROTHERS, ER MISPLACES ER GIVES AWAY ANY CLUES, ONE THOUSAN CURSES BE UPOON YER HEAD!"
"One last requirement, fer yer own luck and protection, ye must kiss the blarney stone within me pot fer prevention. Fer extra luck an twould ye so choose to be, ye may upload a photo together with thah stone fer others ta see."