Strategic summary and impact analysis for patch 7.41e.
Nerfs to Kaya-based items' mana regen amplification, Urn/Vessel stash charges, and Chasm Stone cost increase make mana management more crucial. This directly impacts mana-intensive spellcasters, reversing some of the previous patch's 'Reign of Burst Magic' for those without inherent mana sustain.
Buffs to Orb of Corrosion, Orb of Venom, Eye of Skadi, and Crella's Crozier's Putrefaction Aura significantly increase the potency of health restoration reduction. This favors aggressive lineups that can burst or sustain damage through enemy healing.
Mask of Madness slow resistance buff for melee heroes, and Troll Warlord's Battle Trance slow resistance, slightly shift the meta towards more durable melee carries in sustained fights. Abyssal Blade strength buff also supports this.
Shiva's Guard and Gleipnir recipe cost reductions make these control items slightly more accessible. Heaven's Halberd CD reduction and Witchbane CD reduction further emphasize the value of dispels and disarms.
Nerfs to illusion vision penalties (Morphling, Vengeful Spirit, Grimstroke) and Conjurer's Catalyst's interaction with illusions slightly reduce the overall utility and farming efficiency of illusion-based strategies. Tormentor's projectile disjoint is a minor buff to its survivability against ranged heroes.