Third Runner-Up: Cloak of Flame (for the AD&D games)
This item is a red or orange cloak. It functions as a Cloak +1 for any
wearer. When worn by a magic-user or illusionist, it conveys a
sense of warmth, and functions as a Ring
of Warmth. Upon command,
the cloak can create a Fire Shield spell effect with hot flames
(Protection from Cold only), but this cancels the warmth. The
duration of the fire shield is 1-4 turns. If the wearer casts any fire-based
spell (Fireball, Wall of Fire, etc.), the cloak may be used to
add one point per die of damage done. However, this causes the
cloak to become non-magical for 1-4 turns thereafter.
While magical, this item inflicts 1-4 points of heat damage to any
cold-based creature striking the wearer (such as an ice para-elemental).
Unfortunately, it also gives a +2 bonus on the "to hit" rolls of fire-based
creatures (such as salamanders) attacking the wearer.
The cloak of flame radiates magical heat at all times, except while
the item is non-magical. This powerful effect cannot be negated or
modified, and can always be seen by infravision, even if the cloak
and/or the wearer is invisible. Its heat interferes with infravison
used nearby; creatures within 15' must use normal or magical
vision, as infravision will reveal only a reddish cloud of heat.