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Key takeaways
Hero changes

Advanced-server nerf (second source, corroborates Kazuki 0d7). Skill 2 mana cost increased substantially to curb high-rank and pro abuse of her control/zoning; small compensation of more passive mana restored per Crimson Butterfly. Still dangerous but can't spam S2 freely.

Advanced-server experimental Feral rework (corroborates Kazuki 0d7). Larger passive Wound, easier to break; breaking it triggers Feral state with stacking large-area Claw Strikes. Skill 2 resets each time an HP bar is depleted; higher base damage, lower physical scaling.

Advanced-server ultimate rework (corroborates Kazuki 0d7). Removed cooldown reduction from manually casting the ultimate; base ultimate cooldown shortened instead. Trade-off: auto-trigger immortality window is shorter. Manual timing rewarded over relying on the auto-trigger.

Advanced-server shift toward sustain (corroborates Kazuki 0d7). More spellvamp recovery from skills; Skill 1 damage (hit and shockwave) scales lower with physical attack. Better healing, slightly weaker burst.

Advanced-server buff (corroborates Kazuki 0d7). Skill 1 slow slightly increased. Ultimate no longer leaps to the target location; Odette can move slightly while channeling, preventing accidental cancels. Needs better pre-cast positioning but the channel is more stable.

Advanced-server buff (corroborates Kazuki 0d7). Passive mark lasts longer (bigger lightning window); Skill 1 now refunds half its cooldown on the delayed-damage trigger instead of a fixed amount, making S1 far more spammable.

Advanced-server mobility buff (corroborates Kazuki 0d7). Skill 2 cooldown now shortens as the skill levels up instead of staying fixed, so more engages/catches/repositioning in the mid-to-late game.

Advanced-server buff (corroborates Kazuki 0d7). Skill 2 gains a higher physical-attack bonus on its spinning damage, so building more physical attack makes S2 hit harder.
Item changes
Advanced-server rework (second source, corroborates Kazuki 0d7). The crit-true-damage passive tested on Great Dragon's Sphere last update has moved here. Reworked passive Doom: a critical basic attack deals extra true damage based on damage before reduction (better vs tanky frontliners). To balance, the item now gives lower physical attack and much lower crit damage than before.
Advanced-server change (corroborates Kazuki 0d7). The newer crit-true-damage passive previously tested on it has been removed and moved to Berserker's Fury. (Transcript renders it 'Great Dragon's Sphere'.)
Advanced-server roaming-blessing buff (corroborates Kazuki 0d7). Cooldown significantly reduced, enabling more frequent engages, escapes and surprise setups.
Advanced-server roaming-blessing buff (corroborates Kazuki 0d7). Distance needed to gain one stack of Force reduced, so roamers stack it faster while rotating. (Transcript renders it 'Darhid'.)
Events mentioned
New 5v5 brawl mode (distinct from the 3v3 Chaos Clash). Players choose Chaos Fragments after reaching certain levels for global buffs like attack-speed boost and cooldown reduction, making fights faster and more chaotic. (Three-source: 0d7, this video, ARbNga9xEgk.)
New system applying certain hero changes only in higher-rank matches (temporarily lowered to Master rank on the advanced server for testing). Five heroes get exclusive tweaks: Alpha (ult CD significantly reduced), Dyrroth (enhanced S2 reduces more physical defense), Veil (ult slow much stronger), Edith (S2 CD significantly reduced), Melissa (S1 CD slightly reduced). Includes bush-vision optimizations for Mythical Honor+ ranks. (Two-source: this video + Kazuki 0d7.)