Hero Mastery

Mirana

A lunar archer: Sacred Arrow lands a long stun from range, Leap for mobility + a buff, Starstorm AoE-nukes, and Moonlight Shadow turns the team invisible.

Mastery parameters

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

Members only

Learning 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 Mirana your mastery hero to start — progress shows on Home and Arcana.

Phase by phase

The 1v1: last hits + rune control

You 70%Team 30%

Skills in lane — Max Starstorm (Q) for the AoE nuke + clear/harass; value Sacred Arrow (W) — the long-range stun that decides fights. Leap (E) for mobility + an attack/move-speed buff.
Sacred Arrow pickoff — An Arrow landed from the fog gives a very long stun — a gank that swings the game's momentum.

Skills 1–7

Starting items

Iron Branch25%
Tango16%
Blood Grenade14%
Faerie Fire14%
Sentry Ward9%
Smoke of Deceit8%

Pros buy this phase

Tranquil Boots63%
Arcane Boots25%
Essence Distiller13%

The Midlaner's job this phase

Focus on last hits & denies — a 10-creep lead by minute 5 is a real level advantage.
Minutes 6, 8, 10, …: check water/power runes. A full Bottle means you can spam spells.
Ask a support to arrive 30 seconds before power runes when your lane is rough.

Counters & weaknesses

Slippery escape heroInvisible hero

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

Members only

Why 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 Mirana 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.