Elder Baldur

Behaviour and Tactics
Remains stationary, taking no knockback. It has three attack moves:
 * Summon Baldur: it will occasionally spawn a Baldur
 * Spit Venom: it occasionally spits a blob of infection that will linger on the ground for a small amount of time
 * Shell Curl: when approached, it will curl into a ball that cannot be damaged, as shown here.

The only way to kill it is using Vengeful Spirit or Shade Soul. Kill the Baldurs it spawns to gather SOUL to cast the spell and shoot it when it's not cowering.

Locations
There are four of them throughout the game:
 * One in Ancestral Mound
 * Another guarding the entrance to Greenpath
 * Two in Howling Cliffs, inside a "trap chest".

Trivia

 * One "miniboss" encounter on the boundary of Greenpath and the Howling Cliffs involves fighting two of them at once. Do not stand in the middle of the room, approach one Elder Baldur until it rolls into a ball and stay there until the other one has died.
 * If the Elder Baldur located at the entrance of Greenpath is encountered without Vengeful Spirit, it will not spawn Baldurs and instead only spit venom and curl into a ball when approached.
 * They are referred to as "blocker" in the game files.

Древний бальдр Baldur_anciano