Uniques are not all of the same rarity
When an item is generated rarity is determined first, it can be white, magic, rare or 1 of some number of unique rarity bands. exactly how many tiers of unique there are has not been publicly revealed.
If the item is unique, a unique is chosen from the chosen unique tier.If the item is not unique, then base type etc is determined.
In the case of chancing, base type never needs to be determined. however if a unique tier is chosen for which no unique of that base exists, then the item defaults down to a rare. So the existence of multiple uniques for a base only affects the probabilities of getting those uniques if more than 1 is on the same tier list.
So to be clear, in a world where infernal mantle did not exist, the chances of getting shavs would remain the same. All that would happen is you would get a rare on those rolls where you would have gotten infernal mantle.

Oct
PoE Useful Guides - How to increase the experience gained
In the Path of Exile, the level is usually gradually increased during the mapping. This guide will show you how to gain experience more efficiently.

Jan
Do the chaos clouds stack on top of each other causing super degen zones?
If im just being retarded about how something works someone should tell me because if im not the retarded person then this skill is the thing thats retarded.

Feb
poe4orbs:Path of Exile Siege of the Atlas 3.17 Archnemesis Map Tiers
The new Atlas looks great and simple to understand, lets hope finding the endgame bosses is as simple :D. Atlas passive tree looks to be pretty interesting endgame content aswell, much better then before! Overall looks to be another great content update

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poe4orbs:PoE 3.10 Delirium Witch Popular Starter Build
PoE 3.10 has arrived! Are you ready to take on new challenges? Take a look at the PoE 3.10 Delirium Witch Builds (Elementalist, Occultist, Necromancer) prepared by R4pg for you!