The Sea of Sorrow announcement confirms new bosses and names zero of them. This page states that plainly, then covers the Silksong boss design the expansion will build on — and flags every piece of speculation as speculation.
Stated directly in Team Cherry's announcement, in the phrase "new areas, bosses, tools, and more." This is the only first-party statement about bosses that exists.
Sources: Team Cherry announcement, 15 December 2025
The announcement uses a plural and gives no number. Two is as consistent with the wording as twelve.
None has been published by Team Cherry. Any named Sea of Sorrow boss you encounter is either community speculation or a misattributed Silksong boss.
Team Cherry described the expansion itself as nautically themed. Whether individual bosses follow that theme is a reasonable expectation rather than a stated fact.
Sources: Team Cherry announcement, 15 December 2025
Nothing has been said. Post-launch content in the original Hollow Knight trended harder than the base game, which is a pattern, not a promise.
Team Cherry confirmed that Sea of Sorrow adds new bosses in the same sentence that confirmed everything else about its contents: “new areas, bosses, tools, and more.” No boss has been named. None has been shown. No count has been given.
That is the honest state of this topic in August 2026, and it is worth stating up front because this is exactly the kind of page that tends to get filled with invented specifics.
Search for this and you will find rosters. They come from three places, none of them Team Cherry:
If a page gives you five named bosses for an expansion whose developer has named none, that page knows something Team Cherry has not said publicly, or it is guessing. Almost always the second.
This part is genuinely useful, because it is knowable. Silksong released on 4 September 2025 and its boss design is the foundation the expansion will build on — Hornet’s movement-heavy, aggressive kit, encounters built around punishing recovery windows rather than long health bars, and bosses that gate progression rather than sitting off to the side.
Post-launch content in the original Hollow Knight followed a consistent shape: four free packs, each adding encounters that assumed a player already fluent in the base game. Sea of Sorrow being free fits that history precisely. Whether its bosses follow the same difficulty curve is an expectation drawn from pattern, and this page will not upgrade it to a fact.
A Steam store page for the expansion, a trailer, or any post from Team Cherry naming an encounter. Until one of those exists, everything above is the complete picture, and the length of this page is not evidence that more is known.
For the full announcement and what else it covers, see Sea of Sorrow.
Team Cherry has not said. The announcement confirms the expansion adds bosses and gives no count, no names and no footage. Any specific number in circulation is someone's estimate.
No. As of August 2026 not a single boss from the expansion has been named or shown by Team Cherry. Lists claiming otherwise are drawing on speculation, on datamined material of uncertain provenance, or on bosses that are actually from the base game.
Unknown. Silksong's own roster is already widely considered demanding, and the original Hollow Knight's post-launch content skewed harder than its base game. Neither of those facts is a statement about this expansion.
In whatever areas the expansion adds, none of which have been named. The expansion is nautically themed, so a coastal or undersea setting is a fair expectation and nothing more than that.
There is no reveal schedule. Team Cherry announced the expansion in December 2025 with a 2026 window and has been characteristically quiet since. A Steam store page appearing for the expansion would likely be the first concrete signal.