getting glifnod walk to group leader and say that you
are a glifnod player - after they test your musical
abilities they will tell you what do they know.

Cabal
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You can use knife on beehive to carve a mouse and
then use animation spell to revive it. Purpose is
unknown.
I am sure there is a way for using harp (we need
some strings for it) - I am almost sure they can
be substituted by hairs of unicorn (this item exists)
but how to get these hairs?