Ancient Beowulf
The dragon's room is a deathtrap -- you must be flying to enter safely. If your flight spell ends, you will die and lose your equipment. In addition there are several dangerous Ledge rooms. Do not hunt the dragon -- he will attack you.
Find Fadhmir the Dragon above a POOL OF MOLTEN LAVA in Beowulf. If Fadhmir is not present, 'awaken' him by obtaining the Sword of Weland. (see equipment quests.) ASK DRAGON FIRE. You learn AGNI!
Marauder or Create Mage
Ask a greater salamander
Note: This will consume two practices instead of one. It is not recommended to learn words from greater summons.