<ul><li>Diablo IV's Season 9, Sins of the Horadrim, introduces custom spells where players can craft their own Horadric spells using catalysts, infusions, and arcana with varying rarity levels.</li><li>A major addition in Season 9 is the Horadric strongrooms in nightmare dungeons, found through special methods, where players must activate modifier pillars and defeat monsters within a time limit for rewards.</li><li>Permanent content updates in Diablo IV also include Escalating Nightmare dungeons, leading to a boss fight against Astaroth with new attack patterns, and new positive affixes to sigils for benefits like more power shrines.</li><li>In Diablo III, Season 35 brings back Season 19's stacking Pandaemonium buff with unique killstreak benefits, rotating cosmetics from Season 11, rewards from Haedrig’s Gift, new portrait and pet, and a fresh seasonal conquest rotation.</li></ul>

Diablo IV S9 brings custom spells and nightmare dungeon updates, Diablo III reruns killstreak theme for S35

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