Whispers

Whispers could refer to:
*Whisper of Tides (from Trial by Water)
*Whisper of Gales (from Trial by Wind)
*Whisper of Flames (from Trial by Fire)
*Whisper of Storms (from Trial by Lightning)
*Whisper of Frost (from Trial by Ice)
*Whisper of Tremors (from Trial by Earth)
*Whisper of the moon (from The Moonlit Path)
*Whisper of Dreams (from Waking Dreams)
*Whisper of the Wyrmking (from Storms of Fate)
These key items are obtained from defeating various Prime Avatars, and can be 'redeemed' individually for ability to summon the corresponding avatars or other rewards; see the individual quests for the details.
For obtaining Fenrir (via the quest The Moonlit Path), all the Whispers (except for Whisper of Dreams and Whisper of the Wyrmking) are required at same time in order to receive the Moon Bauble.