Pre Requisite: Understood the Moon

Go to your temple and say 'Sun'

You will be asked to kill legless monster in Mythic:

100 Meter Worm
50 Long Snake
50 Brown Snake

After that go back and report you will be asked to give:

2 Sacred Ring
2 Old Sacred Ring (Can be bought at Trowulan Blacksmith thanks to Sillable for this info)
4 Star Staff
10 Sun Grass
20 Magical White Amber
20 Gold Chestnut
20 Weather Crystal
1 Moon Dress
1 Moon Cap

Next You will be asked to kill:

200 White Snake
200 Fire Worm

Finally report back to your temple. You will get karma and legend.