What happened to mana leech with spells?

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Mana for Spellcasters
In 3.7.0, we changed Warlord's Mark to only apply its leech effects to Attacks, as Mana Leech was one of the easiest ways to recover mana for Intelligence characters, outclassing most other mana recovery mechanics with very little cost. In 3.8.0 we've changed all remaining sources of Mana Leech, either replacing the stats or changing them to only leech from Attacks. This includes Enchantments, the Mana Leech Support, and unique items.

The general philosophy is that mana sustain for spellcasters should be something a player has to think about and find some way to manage, similar to Accuracy for Attack characters. However, we don't want the solution to be a huge investment, and we've tried to provide a few different and interesting ways to sustain mana recovery.

Mana Flasks have received a major review. Values have been adjusted, recovering more mana and having more uses available, so they're more reliable for longer encounters. We've introduced a selection of new modifiers for mana flasks, including a new "Enduring" modifier that lets the mana flask remain after reaching full mana at the cost of duration.

Passives that affect mana flasks have been added or improved, including the new Essence Extraction notable that grants Mana Flasks 1 charge every 3 seconds, as well as Mana Regeneration, increased Flask Charges gained, and removing 1 random Elemental Ailment when you use a Mana Flask.

Stats that subtracted from the final mana costs of skills made managing mana for certain channelled skills far too simple. We've split these mods into a channelled and a non-channelled skill version, with the channelled skill version granting a much smaller reduction.

The Reduced Mana Support has been reworked, and is now the Inspiration Support. In addition to reducing mana cost, it now grants an Inspiration Charge each time you spend mana with the supported skill, up to 5 charges. The supported skill gains more Elemental Damage and Critical Chance for each Inspiration charge. After spending more than a specified amount of mana, the Inspiration Charges are removed. This rewards you for investing in reducing the mana cost of your skills as much as possible to maximise the uptime of your Inspiration.

Clarity has also been changed to grant higher values of mana regeneration at higher gem levels.

A variety of new passive tree clusters have been added, including one that improves mana and Arcane Surge, one that gives curse bonuses and a way to recover mana after hitting or killing cursed enemies, and one that grants Spell Damage based on your maximum mana, up to a limit.