Fever remedy

An unidentified epidemic is rampant in this village……. The disease attacks not adults but only children……. But I still don't know the cause. What an incompetent Pharmacist I am! A fever remedy is the best I can do now. Unfortunately, I have run out of ingredients,. Please, help me.

Get <HFFFA7272>2 Broken Bones<HFFFFFFFF> for me. You can get them by using <HFFFA7272>Collecting Skill of Level 7 or higher<HFFFFFFFF> on <HFFFA7272>Vampire Horrors<HFFFFFFFF> around Glass Lake.
Glass Lake? You can get there by going northeast from this village.

You may feel uncomfortable with the ingredient, but Vampire's cold energy cools down a fever. So please, get <HFFFA7272>2 Broken Bones<HFFFFFFFF> for me. You can do whatever you'd like to get them, but the best way to keep them fresh is to use <HFFFA7272>Collecting Skill of Level 7 or higher<HFFFFFFFF> on <HFFFA7272>Vampire Horrors<HFFFFFFFF> around Glass Lake.
Glass Lake? You can get there by going northeast from this village.

Did you get them? Thank you. I must find a solution very soon, but I don't know what to do. Wait there. I think I'll need your help again.