This means you now have legacy items
Uniques in POE are supposed to be UNIQUE, not better, fluffed up and fancy rares. Some are just fluffed up rares, yes, and others are simply leveling items, but the majority have UNIQUE modifiers on them that cannot be gained anywhere else in the game, and as such can be build enabling. What you're thinking of is something along the lines of Legendaries from other games, which are the super GG items that have no better equivalent and are very rare.
For future reference, any characters in temporary leagues will be returned to their parent leagues, regardless of whether or not the game-play mechanics are being transferred to the core game. However, any League Specific items that you have in your stash/characters will also be transferred to standard, once again regardless of if the mechanics are going to the core game. This means you now have LEGACY items.

Nov
PoE December All Event Prizes - Mayhem, Endless Delve, Flashback
PoE will launch three events after the end of 3.12 Heist in December, Mayhem, Endless Delve and Heist Flashback Event. Each has prepared a large number of rewards for players who reach the level conditions, such as portals, character effects, armour set, etc.

Jun
[3.11] PoE Harvest Witch Starter Endgame Builds
Here is the latest PoE 3.11 Harvest Witch Starter Endgame Builds - Elementalist, Occultist and Necromancer. Whether you like cheap, fast mapping, or boss killer, you can find the build you want.

Dec
Most players between an eternal and a stack of exalts
crafting will be far far more about finding an already good multi t1 base and throwing an exalt at it than it will be about crafting 6T1's that you want from a base white item

Jul
Path of Exile Skill Gems Guide
There are a lot of skill gems in the Battle System of Path of Exile, so if you want to get more powerful and reasonable skills in this game, you need to know more basics of Skill Gems, which is the main content of this article.

Dec
Interested to make good starter builds in Path of Exile
Path of Exile is tricky. End game bosses and maps are ridiculously hard. Without very optimal build strategy you will just waste your time on tier 1-2 maps forever.

Mar
PoE 3.14 Ultimatum Livestream Announcement
PoE 3.14 Ultimatum League Livestream at 1pm on April 8th (PDT). Don't forget Twitch Drops will be enabled from the start of the livestream until 9pm April 8th (PDT)