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There’s no need to start moving quickly, but you do need to Path of exile currency move at full speed toward the end of his voice cue and keep moving until you are confident almost all seven have landed. Anywhere will do, just don’t stand where you were when the voice call for this skill went off.
Phase 4 ≈ 20-0% HP
All Phase 3 abilities plus one new one. Jamanra can conjure machine gun Portals. They appear to have a cooldown of 17 seconds and last for 30 seconds, so two can and usually will be active all the time.
Machinegun Portal
This spawns a portal that projectiles fly out of across the entire arena. One goes northwest-to-southeast, and the other will cross it. Note that when one portal expires, Jamanra can recreate it in a new position. These split the arena into four safe spots, typically one large, one tiny, and two medium. If possible, be in the large one, as you still need to dodge the Overhead Sword Slam.
It’s no longer worth even attempting to dodge the Axe Arc Sweep. Endure it, let the life flask save you.
Standing inside the line of fire and fighting is not an option. Crossing will typically cost you about 400 health, so don’t do it lightly, but if you have to… well, this is why you need life flasks at the end.
The fight becomes much harder after both portals are active. You’ll need to balance – the faster you burn Jamanra down the less time you need to spend in this messy phase, but the more reckless you are the greater the risk of Path of exile currency for sale getting squishified by his other attacks.