Heartsease's one-shot showcase

This one hurls a single spear from away and can one-shot my Scion with 4300 life and 1200 mana with MoM. I got startled in my first death since there were many Legion mobs at scene and I could not identify the damage source. The second time I entered and cleared all other mobs except this one, and...

Happened in Delirium League.

This nasty metamorph had killed my Champion 3 times with 5200 life and 24% less damage taken from hits before I dared to get close to it again and take a snapshot :) You can see my golem was next to death the moment it tried to contact this metamorph. Map mode has monster speed and 100% physical added as lightning. Getting close to it = death within 1s with 3+ successive hits. Getting away from it = merely could scratch it(with my skills) since it had life regen and a bunch of es. This Vaal Pyramid map has double bosses and I had expected it to be lethal, however I had lost all portals to this monstrosity before I even could have a try on the final bosses :(

A stray brand hit this unholy thing :(