Shalendra

Shalendra is one of the hardest bosses in the game. She spawns only as guest monster when summoned with Mirror Marble.

Shalendra has:
 * Increased resistance cap
 * High resistances (90), including physical. You must have resistance-piercing effects.
 * High elemental damage on hit. She adds all damage types on hit. You need resistances.
 * Fire Mastery. You need piercing resistance or overcapped fire resistance.
 * Cleave. She hits everyone nearby so everyone needs survivability.
 * Death Link. Any monsters that spawn nearby are invulnerable.