Biting Catalyst Ring
A burnished gold ring in the shape of two snakes rearing up to bite the finger of the user. If you turn it in the light, the heads appear to bite down.
At the cost of 1 hit die for this rest period, A caster can chose to cast a spell one power level higher without costing a slot. Roll a d20, on a roll of a 8 or less the spell backfires- dealing half the damage to the user (and party if required)

Winter’s Bite
A tarnished short sword - as it is swung materials in the sword leave a trail that appears like falling snow
Magic Short Sword -12d10 +3 - on a successful hit, roll a d20, on the roll of a 11+ the enemy takes an additional 4 cold damage, gaining disadvantage on the next attack. On a 10 or less, the user takes 4 cold damage, gaining disadvantage on the next attack. The cold effect can be used to extinguish fire or freeze still water 

Guillim’s Quicksilver Bracer
A protective arm guard rumoured to belong to a renowned Elmari Marksman. Studies show that it allows the user to fire with preternatural speed. 
Unless surprised the user may always make a free attack before combat starts. On an unmodified attack roll of 16-19 a second ghostly arrow follows the first and does the user’s damage with no additional bonus. On a bonus roll, roll a D4 - 

Helmbreaker
A crude, blunted greatsword caked in blood and rust, and a multitude of chips and scars. The pommel gem glistens like fire in the sun, and seems to draw in the surrounding light as it is swung
2d8+2 crushing damage that adds a -2 to the attack modifier. If attacking foes that are sized Larger or beyond, Helmbreaker deals 2d8 extra damage. If the user misses, they permanently lose 1hp.

Clarke’s Woven Cuirass
A humble looking chest piece that on closer inspection is woven from a hairlike substance that appears to cause light to bend slightly around it. 
User gains advantage on stealth checks but only when on their own. AC-2 armour.Negative perception during the day.  

Adelbert T. Halfbeard’s General Myth and Miscellany - Age of the Sun edition, revised for Neverwinter
An unwieldy tome that appears to have anything and more about the surrounding region of Neverwinter written on it. 
If the user takes an hour to read through the index, they can find some concrete knowledge about it. However, the concentration required causes the user to become fatigued and befuddled - they get disadvantage on all rolls for the next hour

Bilewater Amulet
A small locket that when opens, produces a iridescent green tinted liquid. As far as the user can tell, there is an infinite reserve
If the user so choses they can coat their weapon in this ugly substance roll a d20. They add an additional 1d4 on any damage rolls for the next 4 attacks. If the liquid is imbibed it does 4d4+4 damage and causes the creature to be exhausted. If the original d20 roll was a 1, the user gets some poison on their hand, they will be exhausted until their next long rest.