Hero Mastery

Troll Warlord

A pure attack-speed carry: Whirling Axes for ranged lane + blind, Berserker's Rage swaps to a tanky melee stance, Fervor stacks attack speed, and Battle Trance forces a frenzy of attacks.

Mastery parameters

Your GPM, last hits and damage per game against other Troll Warlord 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 Troll Warlord 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 Whirling Axes (Ranged) (Q) first — 53% of 200 games since patch 7.41, then Fervor (E). Some max Fervor (E) first instead (41%). First talent at level 11.
Level 6 — Battle Trance — Battle Trance gives huge attack speed and forces targets to attack. Open a fight with it for burst + chained bashes.

Skills 1–7

Starting items

Iron Branch35%
Tango13%
Quelling Blade13%
Magic Stick12%
Faerie Fire9%
Circlet of Nobility7%

Pros buy this phase

Power Treads55%
Perseverance36%
Phase Boots8%
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.

Counters & weaknesses

Passive-reliant heroRight-click carry (physical damage)

The items that shut Troll Warlord 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 Troll Warlord 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.