Saxtris

Saxtris is a Rift Guardian, a greatly empowered Copperfang Lurker. He can only be encountered as a random boss in a Nephalem Rift.

In combat, he may not turn invisible, but gains increased damage, as well as following abilities: Both summonings occur more often the more Life Saxtris loses.
 * Swarms: every 10-20 seconds, summons 10-15 s which pursue the heroes.
 * Groping Eels: every 10-20 seconds, summons 10-15 Electric Eels which attack players in vicinity, but do not pursue them.
 * Energy Twister: identical to the ability of Zoltun Kulle (Sand Shaper), creates an erratically moving vortex dealing Arcane damage. When below 50% Life, will summon more Twisters, and more often.
 * Vortex affix.

Having a Countess Julia's Cameo amulet may be helpful in this fight. To avoid being heavily outnumbered and in a middle of many Twisters, players should constantly kite Saxtris to new locations.

Large amount of Area Damage and Life per Kill are advised when dealing with this boss.