Mîm lives with his two sons at
Amon Rûdh in middle Beleriand,
where he keeps a secret treasury.
During Túrin's time with the
Outlaws, Mîm and his sons are
seen as they sneak past the
outlaws carrying heavy sacks.
Mîm gets captured.

In exchange for his life,
Mîm is forced to lead the
outlaws to his secret halls
in Amon Rûdh. Túrin repenting
offers a ransom to Mîm. For
this reason Mîm tolerates the
outlaws, and although he never
loves Túrin, the dwarf at least
comes to respect him.

When Beleg Cúthalion arrives at
Amon Rûdh, Mîm is angry: he hates
Elves, especially the Sindar.
Nevertheless he has to tolerate
the Elf in his halls. After
Amon Rûdh is betrayed to Morgoth,
Mîm somehow escapes, but it seems
Ibûn is killed by Orcs. Eventually
Mîm makes his way to ruined Nargothrond
after Túrin has killed Glaurung, and
takes the treasure for his own.

Húrin Thalion, who has seen all
that had happened to Túrin with
Morgoth's eyes, comes across Mîm
in Nargothrond, and kills him,
deeming him partially responsible
for Túrin's fate. With his dying
words Mîm curses the treasure.
Húrin's band brings the treasure of
Nargothrond to Doriath, where eventually
the gold is a reason for the Sack of
Doriath and the death of Thingol.
But Mîm didn't die he speak a live
for ever spell who saved him from death.

(the text has been modified to fit so he could be a player)