For anyone genuinely interested in having all the information, it is documented here.
It is lengthy, but it should be read before engaging in any debate. The documentation covers:
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How there are achievements flagged as season cutoffs in delves that remain obtainable.
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How Ky’veza’s achievement description was changed at the exact moment the patch went live.
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The absence of any official clarification on this matter.
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That the only available information comes from the PTR and Wowhead (the PTR is not a consistent or authoritative source, and players should not be required to rely on third-party websites for critical seasonal criteria).
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That, throughout this expansion, there has typically been about a one-week gap between patch release and the end of the season.
Additionally, that delve seasons do not necessarily align with Mythic+ or raid seasons:
Official source:
https://us.forums.blizzard.com/en/wow/t/midnight-competitive-season-1-schedule/2209282
According to Blizzard’s own schedule:
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Bountiful Delves → Week of March 17
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Mythic+ → Week of March 24
That delve seasonal timing is independent from Mythic+ and raid seasonal timing.
For the final season, the situation appears to be the same. The achievement “Pruning the Princess” (“Defeat Nexus-Princess Ky’veza in her lair on Tier ?? before the release of the next season of delves.”) remains obtainable despite the stated seasonal restriction, which further reinforces the inconsistency.
Otherwise, what would be the logic behind having some Delve achievements labeled as season cutoffs, while another one is given a pre-patch requirement, if both were meant to be equivalent? If the cutoff was always intended to be tied to pre-patch rather than to the start of the next Delve season, then why are the other achievements still explicitly framed around a Delve seasonal boundary?
Furthermore, the achievements themselves state it clearly: “Delve Season Cutoff,” not “Season 3 Cutoff,” not “Pre-Patch Cutoff,” and not a general expansion milestone. The wording is specific and deliberate. Changing the practical requirement without updating or clarifying that distinction only adds to the inconsistency.
If the terminology says “before the release of the next season of delves,” then the natural and reasonable interpretation is that the cutoff is tied to Delve seasonal structure — not to pre-patch timing or to Mythic+/raid seasonal transitions.