Create 2 Quests. The first will need SHA letters to finish it and the second IYA Letters to finish it. Each quest will give you a part of a word. The Sha item and the iya item. (items created by you)
Then add a last (or maybe more than 1. Depend of what you need) quest which will be finished by giving to the NPC the 2 parts of the word. Then as reward give to player a special item like a "Ulti Rec Rune (+45for +45rec +45luc)" Or something like that.
Then use this: