Hero Mastery

Riki

A shadow assassin: Permanent Invisibility keeps you unseen, Blink Strike closes the gap + backstabs, Smoke Screen silences + causes misses, and Tricks of the Trade strikes from invis.

Mastery parameters

Your GPM, last hits and damage per game against other Riki 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 Riki your mastery hero to start — progress shows on Home and Arcana.

Phase by phase

Laning: last hits above everything

You 80%Team 20%

Skills in lane — Pro cores max Blink Strike (W) first — 66% of 83 games since patch 7.41, then Tricks of the Trade (E). Some max Tricks of the Trade (E) first instead (34%). First talent at level 11.
Diffusal / Basher online — Diffusal slows + burns mana, Basher locks. With permanent invisibility you pick the target and they can't run.

Skills 1–7

Starting items

Iron Branch33%
Tango15%
Quelling Blade12%
Circlet of Nobility9%
Observer Ward9%
Magic Stick6%

Pros buy this phase

Power Treads57%
Orb of Corrosion18%
Perseverance12%
Phylactery8%
Diffusal Blade3%

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.

Counters & weaknesses

Invisible hero

The items that shut Riki 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 Riki 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.