Toss in some powder in the storage bin east of you. Search the bookshelf to get a scientific dictionary. Report into Chillingworth and RS gold give him your potion. Together with the scientific dictionary on your inventory, you'll be able to convince him that it really works. Chillingworth then gets a message in Iorworth, and leaves. Look for the vault to receive a puzzle. The mourners, it seems, want to burn down the entire forest, also Ardoungne as well.
2. For the corrupt lamps, you'll be advised this assignment is beyond your skill because you can't do the chanting of Seren. Talk to either one, but buy RuneScape gold Ilfeen is easier, as speaking to Iswyln will get you sent to locate Ilfeen.