10 points. Defeat all of the Champions in Toothmaul Gully.
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These elites are solo-friendly with preparation. They respawn by killing nearby enemies. I believe if you kill 5 sets of enemies near the elite spawn it will spawn the elite on the 6th spawn. Regular enemies are on a 1 minute respawn timer.
Bloodroot will only spawn once all of the Spriggans name Bloodroot Protector are killed off: