The Reforge panel now shows the current price multiplier on permanent upgrades, so you can see why every price moves when you buy one.
Arcane Essence from a reforge now tapers off past Diamond. A single very long run can no longer pay for most of the permanent tree in one sitting.
Permanent upgrades are priced on how many levels you own across the whole tree, not just how deep a single line goes. Spreading wide now costs what spreading wide is worth.
Your first reforge is completely untouched. Sapphire pays exactly what it always paid.
A run that reached the top of the gem ladder could bank enough Essence to buy around 50 permanent levels at once, which ended prestige progression far earlier than intended.
Runs already in progress when you update keep their previous Essence payout until you next reforge, so nothing you already earned is lost.
Saves holding out-of-range permanent upgrade levels no longer produce broken damage values and unaffordable prices.
Reforges from Obsidian onward now pay roughly half the Essence they used to. This is deliberate, but it is the number most likely to need another pass. Feedback welcome.
Because prices scale with your total level count, buying expensive upgrades before cheap ones is very slightly more efficient.