Durendal

Overview
The Durendal Greatsword is the second Legendary sword available in the game. Features blue, orange and gold accents, can be used at level 65. Base damage is 682 and has a 18% chance of critical attacks. When it is +20 it does 1364 damage. It is currently the strongest weapon in the game right now.

It is dropped by the Floor 7 boss (Smashroom)

Boss has the appearance of a mushroom with two arms and three legs.

Trivia

 * This sword may have been named after Durandal, a sword owned by Eliwood in Fire Emblem. (either could be named in honor of Xenovia from Highschool DxD and current wielder of Durandal in the series)
 * This sword is considered one of the legendaries swords in real life used by many heroes. (In the legends this sword was forged along with other 3 swords... it says that durandal power outmaches the Excalibur itself).