Why Play Bloodseeker?
Bloodseeker is a Core hero, which means he must prioritize earning plenty of Gold and XP to dominate the game. The undisputed king of speed, Bloodseeker will run foes down, and make sure they can't escape the onslaught.

In the early game, prioritize earning last hits on creeps, as he needs the kills to sustain his health. Refrain from needless fighting unless you have decent Thirst buffs or your ultimate is ready.

Bloodseekers job is to chase down fleeing enemies and forcing them to stand their ground with his ultimate. He is strongest at the mid-game when he has a few fighting items and is frequently ganking with his team. Since Bloodseeker will almost always be at the front of fights, a Black King Bar is mandatory to prevent enemies from disabling you.

In a fight, good use of your ultimate (Rupture) is key. Use it on heroes you absolutely need to catch, such as mobile heroes or opposing Cores (dudes that deal all the damage). Use your Blood Rite after to force them to take Rupture damage or Blood Rite damage. Finish the job by meleeing them to death and chasing low health heroes. Try not to fight alone, and try not to get caught out alone, keep an eye on your minimap and call for help if you need it.

Depending on the enemy heroes, Bloodseeker may need to buy different items to deal with them. Look to your situational items and see which ones best fit your game.