While fighting her she will periodically summon a False User that will resemble either Saradomin, Zamorak or Lucien. False Users will use a special attack before disappearing if not killed, so when the echo summons one it is imperative to kill it as quickly as possible, ideally using abilities such as Chain or Ricochet. The False User that looks like Saradomin will heal the Echo of Jas a large amount, the Zamorak will drop rocks on your current location dealing moderate damage over time and the Lucien will shoot an unavoidable, powerful attack that deals roughly 2000 damage.