Hero Mastery

Bloodseeker

A blood hunter: Blood Rite silences + damages an area, Bloodrage amplifies damage, Thirst grants speed + vision on wounded enemies, and Rupture punishes anyone who runs.

Mastery parameters

Your GPM, last hits and damage per game against other Bloodseeker 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 Bloodseeker 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 — Pro cores max Blood Rite (W) first — 52% of 71 games since patch 7.41, then Bloodrage (Q). Some max Bloodrage (Q) first instead (39%). First talent at level 11.
Level 6 — Rupture — Rupture punishes movement — use it on a fleeing target so running is suicide.

Skills 1–7

Starting items

Iron Branch34%
Quelling Blade13%
Circlet of Nobility12%
Tango12%
Magic Stick11%
Faerie Fire7%

Pros buy this phase

Phase Boots62%
Power Treads29%
Falcon Blade2%
Cornucopia2%
Hand of Midas1%

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

Magic burst hero

The items that shut Bloodseeker 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 Bloodseeker 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.