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Hero Mastery
Arc Warden
A micro split-push carry: Tempest Double clones your items and spells, Magnetic Field grants evasion + attack speed, and Spark Wraith pokes and farms from afar.
Mastery parameters
Your GPM, last hits and damage per game against other Arc Warden players — average vs Top 20%.
Members onlyLearning journey
- 1 Know the kit
- 2 Win the lane
- 3 Timing & rotations
- 4 Win the fights
- 5 Master
5 stages, each with one target from your own games and one short quiz. Make Arc Warden your mastery hero to start — progress shows on Home and Arcana.
Sign in through SteamPhase by phase
Laning: last hits above everything
You 80%Team 20%
Skills in lane — Pro cores max Spark Wraith (E) first — 77% of 66 games since patch 7.41, then Flux (Q). First talent at level 11.
Level 6 — Tempest Double — Send the Double to push/farm a second lane while your real hero keeps farming — you control two places at once.
Skills 1–7
1
2- 3
4- 5
6- 7
Starting items
Iron Branch42%
Circlet of Nobility16%
Observer Ward13%
Faerie Fire11%
Tango8%
Gloves of Haste3%
Pros buy this phase
Hand of Midas81%
Power Treads11%
Maelstrom4%
Perseverance1%
Falcon Blade1%
The Carry (Safe Lane)'s job this phase
- Aim for 45–50 last hits by minute 10 — check that number every game, it's your main KPI.
- Don't over-harass: trade HP only when it doesn't cost you last hits.
- Minutes 2 & 4: ask your support to pull so the lane stays near your tower.
Arc Warden
Counters & weaknesses
Right-click carry (physical damage)
The items that shut Arc Warden down, 3 heroes that trouble it, and your answer when you play it.
Members onlyWhy this way? How OpenAI Five learned
One hero, one role first
OpenAI's first bot played only Shadow Fiend, only mid, until it mastered it. Stay on Arc Warden in one role before moving on.
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.
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.
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.