If you travel to Carlin and find Rachel, you will notice she is the only NPC that buys Talons from the players in all of Tibia.
There are two points of interest with Rachel:
1- She only buys a couple of items from the player, with the Spell wands and Talon being the only items listed (apart from empty potions/vials)
2- Her front sign also reads as: 'The mysterious shop for sorcerers and other magicians'
Perhaps the reference of other magicians could refer to druids, or perhaps it could allude to why she purchases Talons given the magical rumors around the warlocks of Demona and talons.
Why though, is she the only NPC that wants to buy Talons? Is there any quest or lore that can answer this?