Weapon (rapier), legendary (requires attunement by a creature of neutral alignment)
Winterwiess is an exotic rapier crafted from pure, platinum crystal. Icy-blue gems are embedded into the weapon's guard, and it constantly feels cold to the touch.
You gain a +2 bonus to attack and damage rolls made with this magic weapon. It has all the functions of a typical frost brand weapon, as well as the following additional properties.
Frost Missiles. During your turn in combat, you may command Winterweiss to cast the spell magic missile, as if you were using a 6th-level spell slot. The darts created by Winterweiss deal cold damage instead of force. Once cast, this spell does not recharge until the next dawn.
Frigid Construct. You may use your action to focus Winterweiss'es inner power on a creature of your choice that you can see with a CR of 3 or lower. When the image of that creature is firmly set in your mind, Winterweiss will create a crude simulacrum of your target made entirely out of ice at a space of your choice that is directly adjacent to you. You may then give whatever commands you wish to your frigid construct as a bonus action on your turn. The construct understands the commands of its master but cannot speak, and it otherwise possesses the exact same statblock, features and abilities as the creature it is mimicking.
Only one frigid construct can be created each day, and it will stay with you until dawn, at which time it disintegrates into inert shards of ice. You may dismiss the constrict early as a bonus action at any time. Once this property is used, you may not create another frigid construct until the next dawn.
Arachnophobia. Winterweiss secretly has a crippling fear of spiders, and as a result the weapon will literally pull back in its wielder's hand whenever hostile spiders are encountered. While wielding Winterweiss, your weapon attacks are made at disadvantage against spiders and driders.
Sentience. Winterweiss is a sentient lawful neutral weapon with an Intelligence of 14 (+2), a Wisdom of 12 (+1), and a Charisma of 16 (+3). It has hearing and darkvision out to a range of 90 feet.
The weapon can speak, read, and understand Common, and can communicate with its wielder telepathically. While you are attuned to it, Winterweiss also understands every language you know.
Personality. Winterweiss possesses the soul of a young, teenage heiress from a past age, presumably once a member of a long-forgotten noble family. Winterweiss is often insistent on following rules and laws, and will typically favor actions that run parallel to that predisposition. She is very picky in terms of who it is willing to attune with. Stick it in the hands of an inexperienced rapier-user, and she will waste no time in calling you a dunce, and berating you for your amateurish lack of form.
Winterweiss has a somewhat bossy attitude in general, though slightly less so towards its attuned wielder. She insists on being cleaned on a regular basis, as she absolutely hates being left dirty for too long.
In spite of its usual attitude, Winterweiss is most of all an attention-seeker. Her ultimate goal is to accrue glory and recognition for herself and her wielder whenever the opportunity presents itself, and it will actively encourage her wielder to either boast about his or her recent accomplishments, or to praise its craftsmanship as the primary contributor to triumphing over a particularly harrowing obstacle. If Winterweiss goes three days or more without having these desires met, a conflict between it and its wielder occurs at the next sunset.