Elder Baldur

Elder Baldurs are big enemies that curl up when the knight comes close. One Elder Baldur is in the Ancestral Mound, another blocks the way to Greenpath.

Strategy
Shoot two fireballs. Then jump and try to hit the small Baldur as soon as he spits him out.

Instakill Glitch
In patch 1.2.2.1 it is possible to kill the Greenpath Baldur using only one fireball. After waking him up, walk back to cast a fireball that will kill him off-screen.