Zenistar

The Zenistar is a melee weapon available through the Daily Tribute system as a reward for logging in for 300 cumulative days. Its Charge Attack ejects a flying fire disc, damaging nearby enemies.

Characteristics
This weapon deals primarily and  damage.

Advantages:
 * Third highest base damage of all melee weapons, along with Jat Kittag, Fragor Prime, Sibear, and Scindo Prime.
 * Innate damage – effective against Infested and Cloned Flesh.
 * High damage when the disc is ejected.
 * Comes with polarity.
 * High status chance.
 * Stance slot has a polarity, matches Rending Crane.
 * Staggers all enemies on normal attacks (like Jat Kittag).
 * Disc can be thrown using charge attacks, damaging enemies in range of the disc.
 * The Zenistar's damage changes to physical damage and gains a bonus to attack speed.
 * Disc benefits from bonus damage from stealth while invisible, increasing damage heavily.

Disadvantages:
 * Low attack speed.
 * Low critical chance.
 * Bonuses from, or  mods do not apply while the disc is attached.

Acquisition

 * The Zenistar is exclusive to the Daily Tribute system, and can only be attained after 300 accumulated log-ins. It comes with a free weapon slot and pre-installed Orokin Catalyst.
 * With (which introduced the Daily Tribute system) releasing on December 3, 2015, this weapon first became available on September 26, 2016.

Trivia

 * The Zenistar's name likely stems from zenith, whereas its design is inspired by a sundial.
 * The Zenistar is the first weapon in Warframe that changes its damage distribution: in this case heat is replaced by physical damage of the same amount when the disc is discharged from the weapon. This allows the weapon to be made for pure elemental builds (with the disc on) or have the ability to deal physical damage (like heavy slash procs) with the disc ejected.
 * The console version of the Zenistar had different stats upon release, being identical to those of the Scindo Prime's (with innate damage instead of physical damage), but couldn't launch its disc, similar to how the Azima couldn't launch its magazine when it was released on consoles.

Bugs

 * Sometimes the disc stays inside the Zenistar even when the disc has launched. This is only a visual bug and does not affect the weapon in any case.
 * Enemies who are dealt bonus stealth damage when in Undertow or Cloud Walker may continue to receive this bonus damage even when leaving the ability. This is especially true when it is built for blast damage, for whatever reason.
 * Currently the Disc will not add time to allies affected by Valkyr's Eternal War augment, however the blade itself will.
 * When the Dominion Blade Skin is equipped on the Zenistar, the blade will appear to be extremely large.