Black Knightshade

The Black Knightshade is an upgrade of the Knightshade in Plants vs. Zombies: The Final Showdown.

Like the Knightshade, it attacks nearby zombies with a sword, dealing 40 DPS per hit, with the range of a Bonk Choy but not backwards.

However, where Knightshade has a random chance to stab zombies for massive damage, the Black Knightshade will stab zombies under a specific circumstance. She will perform the instant-kill stab, dealing 1800 DPS, any time that the targeted zombie is frozen or stunned, but never otherwise.

She is unlocked by purchasing her from Burt's Bits & Bobs for $10,000, after unlocking Knightshade.

Made by Milesprower2.

Origin
Its name is a reference to a "Black Knight", a common literary villain originating from Arthurian legends.

Appearance
A purple flower wearing a dark, almost black knight's helmet with red highlights. It has some leaves sticking out of its stalk about halfway up, and holds its sword (which is the same colour scheme as its helmet) in one of those leaves.

Almanac Entry
Black Knightshade

Attacks zombies with its sword, and stabs zombies that are paralyzed.

Damage: double (slash), massive (stab)

Range: very short

Attack speed: average

Plant Food effect: throws swords at ten spaces

Must be planted on Knightshades

The legendary Black Knightshade usually spends her time terrorising other plants and being generally villainous. However, in times of need, even she can band together with the good guys to defeat a common foe.

Cost: 100

Recharge: very slow

Plant Food
Rains swords down on ten spaces, causing massive damage to zombies. Not exactly effective, as it's largely random, but the swords usually land on spaces occupied by zombies, provided there are enough onscreen.

Strategies
Black Knightshade is an extremely valuable, powerful, and cost-effective plant with the right support. It works amazingly well coupled with Kernel-pults, Sonic-shroom, Katy Peary, or Plume-shroom. These plants all have either a way to guarantee or randomly land a stunning effect, and if this happens within the range of Black Knightshade, the affected zombie will almost certainly get instakilled.

Due to the duration of most stuns, Black Knightshade can easily land multiple hits against a stunned zombie, making it effective against zombies capable of surviving instant-kills, and possibly making it one of the best options around for eliminating Undying Zombies.

It also combos very well with Iceberg Lettuce or Ice-shroom, and especially Iceberg Lettuce's Plant Food effect, allowing you to easily take down groups that have piled up near a Black Knightshade.

Trivia

 * This is the only upgrade plant in Plants vs. Zombies: The Final Showdown that is an upgrade of a new plant, rather than a previously existing one.