Dota 2 Trove of Terror: New Tidehunter Arcana, Drow Ranger Arcana Returns, Price and Bad-Luck Protection

Tidehunter fans have waited years for this one. Valve released the Trove of Terror on October 6, 2026, a Halloween-flavored treasure packed with 15 Immortal sets, a brand-new Maw of the Megalodon Arcana for Tidehunter, the return of Drow Ranger's Arcana, and new looks for Roshan and the Tormentor. It's the first big cosmetic drop since The International 2026 wrapped up in August, and it comes with a bad-luck safety net that changes how much you might end up spending. Here's what's inside, what it costs and what you should know before you open one.

TL;DR

• Trove of Terror went live on October 6, 2026, and you buy it from the in-game store.
• It contains two Arcanas: the new Maw of the Megalodon for Tidehunter and a returning Drow Ranger Arcana.
• 15 Immortal sets, including Rare sets for Shadow Shaman and Nyx Assassin and a Very Rare set for Legion Commander.
• Milestone rewards: a new Tormentor look at 12 openings and a new Roshan look (plus a courier) at 40.
• Bad-luck protection guarantees an Ultra Rare item on the 50th opening if you haven't had one by then.
• Each opening costs $4.99 in the US store, according to multiple reports, and nothing from the Trove can be traded or sold.
• Valve hasn't announced an end date.

The headliner: Maw of the Megalodon

Valve's announcement leans hard into cosmic horror, describing an Arcana that "emerged from a bloodstained sea." In practice, Maw of the Megalodon turns Tidehunter into a huge shark-like monster with a new model, custom animations, ability effects, taunts and voice lines. He even drags a familiar-looking corpse around, which Valve jokingly calls part security blanket, part snack.

Like every Arcana, it's purely cosmetic and doesn't change how the hero plays.

Valve also teases that the Arcana has three shark-toothed designs, and that you have to master the Arcana's "secrets" to unlock all of them. That suggests the extra styles are unlocked over time rather than available the moment you equip it.

Drow Ranger's Arcana is back

The second Ultra Rare reward is a returning Arcana for Drow Ranger. Valve says she can either look the way she originally did or take on a new "grave-stalking" form. Coverage of the Trove lists it as the Sepulchral Stalker bundle, which includes her existing Dread Retribution Arcana. If you missed it the first time around, this is your chance to get it again.

All 15 Immortal sets

Twelve of the sets are standard drops, while three have their own rarity tiers:

The Anti-Mage set stands out because it comes with a Persona, so it changes more than just his outfit. If you end up with duplicates, you can recycle six sets for one extra treasure.

Roshan and the Tormentor get new looks

This is the part that affects every match you play in, not just your own hero. Opening enough Troves rewards you with cosmetics that change how two neutral bosses look in your games:

• 12 openings: Obscene Eye Ball, a new all-seeing appearance for the Tormentor.
• 40 openings: R'shan the Eternal, an eldritch new design for Roshan, along with a matching Baby R'shan the Eternal courier.

Valve's announcement frames these as the creatures you "attract" by opening more treasures, which is a fitting way to describe a reward ladder.

Odds, bad-luck protection and price

This is where the Trove of Terror gets important for your wallet. Reported odds on the first opening are very low: about 1 in 2,000 for a Rare item, 1 in 20,000 for a Very Rare and 1 in 100,000 for an Ultra Rare. Those odds go up with every opening that misses and reset once you get an item from that tier.

The safety net is the 50-opening guarantee: if you haven't gotten an Ultra Rare by your 50th treasure, that one gives you an Arcana. Reports agree you don't get to choose which of the two Arcanas you receive.

At $4.99 per opening, the reported US price, the math adds up quickly:

Two more things to keep in mind. First, nothing from the Trove can be traded, gifted or sold on the Steam Community Market, so opening treasures is the only way to get these items. Second, Valve hasn't given an end date or said whether the Trove is permanent, so there's no rush right now, but no promise it'll stick around either.

What it means for players

For Tidehunter fans, this is a long-awaited moment: a full Arcana with a new model and voice for a hero that has been a fixture of the offlane for years. For everyone else, the Roshan and Tormentor looks are the most visible additions, because they change how the map looks for everyone in your games.

The Trove also arrives during a quiet stretch for gameplay. The current balance patch is still 7.41f, released on September 15, so this is a cosmetic update rather than a balance shake-up. If you're tempted, decide on a budget before you start, since the worst-case path to an Arcana is 50 openings. And if you only want the Roshan look, it's a fixed 40, no luck needed.