Geranis Whitemorn wants you to swim to the bottom of the lake east of Suncrown Village and use the Bundle of Medallions on the Altar of Tidal Mastery. Summon and slay the elemental known as Aquantion and return to Geranis.
Show him our thirst for vengeance has not waned! Take these medallions and lay them at the Altar of Tidal Mastery at the bottom of the lake. Aquantion shall immediately answer your summons!
<BbrR> Beware, <race>! Without our magic controlling him, his wrath will be unrestrained. Destroy Aquantion so we may rest!
Has Aquantion been destroyed yet?
You've avenged our deaths and broken Aquantion's grasp on our souls. We may finally rest.