(Print) Use this randomly generated list as your call list when playing the game. There is no need to say the BINGO column name. Place some kind of mark (like an X, a checkmark, a dot, tally mark, etc) on each cell as you announce it, to keep track. You can also cut out each item, place them in a bag and pull words from the bag.
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Make Minions who are controlled by your Character Actions (They Fire Arrows when you do etc)
Fix Life Leech/Recovery
Give the option for Energy Shield to actually be a defensive layer and not just Blue Life
Rare Mods based on the mob type (Zombies get chaos auras or revival or dropping tar as rare mods)
Commit to Flask Changes and remove all dependency on flasks for defences (Buff other sources)
Bring PoE2 Stun system to PoE1
Alleviate Socket Pressure with an interesting mechanic or innovation
Evolve the Transfigured Gems system by just giving Skill Gems their own Passive Trees
Continue with league mechanics giving you the choice of when to engage with them (eg. TotA Silver Coins)
Change Auras so they only give a set amount of their bonuses to allies.
Rework Dual Wielding and add mods that incentivize using two weapons
Add some form of Spell Resistance to left side of the tree as a Str/Int version of Spell Suppression
Give Two Handed weapons some unique implicit stats (More Base AoE etc)
Improve Mob Formations, more variety not just packs
Give more interesting soul-bound rewards like Sanctified Relics
Add a new socket type that can be "flipped" using a hotkey if it has a support gem socketed in it
Balance Baseline Build Viability
Innovate on visually communicating enemy power level (Reading Mods isn't optimal)
Revisit Ward and make it an interesting defense layer
Modernize Cast on Crit, give skills proc coefficients to de-emphasize all CoC builds only using skills like Cyclone
Make Drops more valuable by having more mods that only spawn on dropped items
Rework Summoning and Minions (Employ some of PoE2 changes if possible)
More Skills, More Uniques, More Supports, More More
Rebalance Auras make the stats they provide more accessible but Aura Effect is stronger when invested in