Hero Mastery

Naga Siren

An illusion + control carry: Mirror Image multiplies farm, Ensnare roots a target (through BKB), Rip Tide adds AoE burst, and Song of the Siren sleeps an entire fight.

Mastery parameters

Your GPM, last hits and damage per game against other Naga Siren 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 Naga Siren 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 Mirror Image (Q) first — 98% of 132 games since patch 7.41, then Rip Tide (E). First talent at level 10.
Mirror Image — farm explosion — Four illusions means you farm several camps/lanes at once. Build net worth far faster than most carries.

Skills 1–7

Starting items

Iron Branch34%
Circlet of Nobility19%
Slippers of Agility16%
Tango11%
Quelling Blade10%
Magic Stick4%

Pros buy this phase

Power Treads89%
Yasha11%

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

Illusion heroRight-click carry (physical damage)

The items that shut Naga Siren 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 Naga Siren 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.