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.

Jul
Path of Exile t16 Maps Guide
In this t16 Maps Guide, I will teach you how to sustain t16 Maps and how to earn 4300 chaos in 6 hours(you can buy Poe Chaos Orb from our website too), I think this is not easy to most of the new players, so you guys should appreciate

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.

Mar
poe4orbs:PoE 3.10 Delirium Shadow 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 Shadow Builds (Assassin, Saboteur, Trickster) prepared by R4pg for you!

Dec
I still have so much fun in PoE after so many years
The beginning is the best thing ever! My tips for you is bind your left click button to Move only.

Dec
Shaper seeds are tier based
Farming a specific map doesn't increase it's drop rate, it will just narrow the layout down. The benefits are to the market though. More map trading probably.

Oct
Path of Exile Useful Tips 02 - Check Your Unfinished Map
In order to help players better enjoy the fun of Path of Exile, we decided to share some useful tips here regularly. This time we will show players how to check your unfinished map.