ive passed that quest with no problem, what is the name of the quest please?
And if you need 20 pcs, i guess that is just - 20 pcs of kaspa shell.
You need to be ready, that in tantra many many items and quests have loads of spelling issues. So you have to double check and use your imagination. I had similar problem many years ago, when i was looking days all over tantra, where the heck is YASDA, and only after few days, i realised that YASDA is YASITA
Anyway, if you tell me the name of the quest, i will help you with this.