Related
The ORB of Wind
Page
4
Climb the five levels of the Floating Castle and face TIAMAT, the Fiend guarding the ORB of Wind.
The Final Battle
Page
2
Return to the Temple of Fiends and warp to the Temple of Fiends Past to begin your final quest.
The Venom Blade is weak as a Weapon, but its ability to cast Poison when used as an item is useful and entertaining. It's a fairly accurate Spell, so feel free to spend idle turns trying to kill all your non-Poison-resistant enemies for free. Tiamat is even vulnerable to Poison, so you may get a chance to use this Weapon to great effect shortly after finding it.