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Hero Mastery

Doom

A single-target ultimate to shut anyone off: Doom silences and burns one key hero for 15+ seconds — deleting them from the fight.

Pos 3 · Offlaner
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Mastery parameters

Your GPM, last hits and damage per game against other Doom players — average vs Top 20%.

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Learning journey

  1. 1 Know the kit
  2. 2 Win the lane
  3. 3 Timing & rotations
  4. 4 Win the fights
  5. 5 Master

5 stages, each with one target from your own games and one short quiz. Make Doom your mastery hero to start — progress shows on Home and Arcana.

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Phase by phase

Laning: pressure their carry, don't feed

You 50%Team 50%

  • Skills in lane — Max Scorched Earth (W) first: the DPS + heal + move speed wins your lane and farms fast. Grab Devour (Q) early for gold + a creep skill, Infernal Blade (E) for the mini-stun.

  • Level-6 Doom — pickoff — Your first ult fully disables an enemy carry/mid. Devour a creep with a stun/slow to lock them down first.

Skills 1–7

  1. W1
  2. Q2
  3. W3
  4. E4
  5. W5
  6. R6
  7. W7

Starting items

  • Iron Branch33%
  • Gauntlets of Strength33%
  • Tango9%
  • Circlet of Nobility7%
  • Magic Stick6%
  • Quelling Blade5%

Pros buy this phase

  • Phase Boots88%
  • Drum of Endurance12%
The Offlaner's job this phase
  • Your goal isn't perfect farm — it's making sure THEIR carry doesn't farm. Contest every last hit.
  • Secure range creeps with a spell if needed; XP matters more than gold for you.
  • If the 1v2 is rough, hug your tower and ask the soft support to help zone.

Doom

Counters & weaknesses

Tank (big HP & armor)

The items that shut Doom down, 3 heroes that trouble it, and your answer when you play it.

Members only
Why this way? How OpenAI Five learned

  1. One hero, one role first

    OpenAI's first bot played only Shadow Fiend, only mid, until it mastered it. Stay on Doom in one role before moving on.

  2. Small, measurable rewards

    OpenAI Five was rewarded for last hits and staying alive long before it understood winning. That's why each journey stage has one number to hit.

  3. From yourself to the team

    Its 'team spirit' rose over the game: early on, look after yourself; late, play for the team. Each phase's meter shows the split.

  4. Use proven builds

    OpenAI Five's builds were hand-written, not trial and error. Start from the pro build, then experiment.

Phase items: what pros buy on this hero (OpenDota). Parameters: percentiles of players on this hero (OpenDota). Item effects checked against Valve's own item data.