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:
 * Tied with Scindo Prime for the third highest base damage of all Heavy Blades, behind War and Galatine Prime.
 * Innate damage – effective against Cloned Flesh, Infested, and Infested Flesh.
 * Very high status chance.
 * Normal attacks staggers enemies.
 * Charge Attack releases a floating disc that deals on contact and then releases a  explosion. The disc stays in place and radiates a damaging  aura for 45 seconds.
 * Weapon handle changes to deal physical damage and gains an attack speed bonus.
 * High damage – effective against health.
 * Innate polarity.
 * Stance slot has a polarity, matches.

Disadvantages:
 * Innate damage – less effective against Proto Shields.
 * While the disc is attached, the weapon does not benefit from, or  damage mods.
 * While the disc is thrown, the handle has low and  damage – less effective against shields and armor.
 * Very low critical chance.
 * Lowest base attack speed of all Heavy Blades.

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.
 * Despite being a heavy blade, the Zenistar is held like a hammer by the Warframe.

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.
 * Sometimes attempting to throw the disc will result in the disc not being ejected from the handle. Swapping to a different weapon and then swapping back might fix the issue.
 * When the Dominion Blade Skin is equipped on the Zenistar, the blade will appear to be extremely large. While this was unintentional, the developers have stated that they like it, so it is unlikely to change.