Summoned unit created by the Beastmaster's Summon Quilbeast ability.
Level 1 Summon Quilbeast summon a Quilbeast
Level 2 Summon Quilbeast summons a Dire Quilbeast with Frenzy
Level 3 Summon Quilbeast summons a Raging Quilbeast with Frenzy and splash damage.
Only Raging Quilbeasts have splash damage. The splash radii is 12.5. You can summon as many Quilbeasts as you are able to. Quilbeasts last 70 seconds.
The Frenzy icon looks very similar to the Bloodlust icon.