Southwest at Before a Strange Barrier (walk through wall). Walking back out will damage you for a lot of hp.
General preparation. The room right before the dragon is high-regen so it's a good place to rest, but keep in mind the dragon sometimes has a move to pull in adventurers from this room, so you have to be alert at all times in case this happens.
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a frozen dragon's heart - 5 charges/day of level 20 cure light. 120 day timer. a dragonscale bracer (new) a dragon's ribcage (new) a ring of the winding stream (new)
Item 'a frozen dragon's heart' is type artifact, alignment 0, made of ice (in (used) condition), has keywords 'frozen dragon heart'. This item weighs 0 stones and 10 pebbles, and is valued at 0 gold. This level 20 item has the attributes: no-sac no-auction insulated wont-fuse nodecay bind-on-use This item has a default lifespan of 120 days and will expire on Sat Feb 1 20:16:05 2014. Has 5 of 5 total charges per day of level 20 spell 'cure light'. This artifact will be fully recharged in approximately  hours. *Your level must be less than 60 to use this item. *This item has a limit of  per character. *This item is bound to player. Small, shriveled and very lonely-looking, this heart is now a rough black sphere the size of your fist. In life, the dragon's heart burned with fire and blood and sent them spewing across the land. Now, the energy remaining is only useful in short bursts, taking time and effort to squeeze it out of this frozen little ball. There's some left, but it looks like only so much can be forced out every day. Treat it well, better than its owner was. Item 'a dragonscale bracer' is type armor, alignment 0, made of admantite (in (new) condition), has keywords 'dragonscale bracer scale', equipped on the wrist. This item weighs 0 stones and 15 pebbles, and is valued at 26,800 gold. This level 20 item has the attributes: no-auction insulated wont-fuse no-dispel no-tweak bind-on-wear This item has a default lifespan of 120 days and will expire on Mon Feb 3 10:01:49 2014. Armor resistance is 1 pierce, 1 bash, 1 slash, and 0 exotic. Affects ar by 1. *This item may be repaired 4 times and renewed 4 times. The pervasive cold radiating off the chipped scales would be enough to numb an arm entirely if not for the obsidian sealed onto the bracer's interior. Considering how rare dragons are, let alone undead dragons, this might be worth something. Some sort of chemical reaction is slowly spreading from the inside out, tinting the diseased scales with a ever-healthier red, as if the dragon's skin still has something left to burn inside it. +++ a dragonscale bracer, if worn, has a 0.2% chance per tick to summon a dragon to assist the bearer, with a maximum frequency of every two Alyrian hours. Item 'a dragon's ribcage' is type armor, alignment 0, made of admantite (in (new) condition), has keywords 'dragon rib cage ribcage', equipped as a shield. This item weighs 0 stones and 40 pebbles, and is valued at 27,050 gold. This level 30 item has the attributes: no-sac insulated wont-fuse no-dispel no-tweak bind-on-wear Armor resistance is 2 pierce, 2 bash, 2 slash, and 1 exotic. This armor has the additional attributes: reflect-magic *Your level must be less than or equal to 60 to use this item. *This item may be repaired 4 times and renewed 4 times. Less a ribcage and more several splintered ribs bound together with another bone, this cruel creation forms a shield of sorts that curves around you. Diseased skin has been drawn over the front and tipped with scales in positions awkward enough to snag an enemy's weapon, while the ribs themselves could produce a vicious bash. A sheen of antimagic oil covering the scales glitters through a hundred colors, waiting for the fire to rise. +++ when fighting a Boss, a dragon's ribcage has a 50% chance to heal its bearer by 5 HP. Item 'a ring of the winding stream' is type jewelry, alignment 0, made of liquid (in (new) condition), has keywords 'tiny stream winding ring', equipped on the finger. This item weighs 0 stones and 5 pebbles, and is valued at 22,250 gold. This level 10 item has the attributes: insulated wont-fuse no-dispel unique no-tweak bind-on-take Affects damage-prcnt by -10. Affects healing-others-prcnt by 10. Affects sp-regen-prcnt by 10. Affects ar by -6. *Your current-roomflag must be equal to safe to use this item. *Your level must be less than or equal to 80 to use this item. *This item may be repaired 4 times. *This item is bound to player. This little trickle of water has nowhere to go, and flows nowhere but round and round in a circle. It's crystal-clear, almost entirely weightless and probably very easy to lose. It feels vaguely solid, just enough to slip it on a finger or through a chain. The slow revolutions of the water contained within, the clarity with which the light sparkles through the water - it's all very calming, perhaps by design. Weaker, softer, but more alive.