Elder Thornback

Avoid the Elder thornback when you lack a prepared fight or escape route. Its current community record describes pursuit, retreat and berserk phases, not an invulnerable enemy.

Recognize the layer-five boss

The Elder thornback appears in Overgrown Depths, where the current community entry says three are placed when the layer loads. Its listed health is 6000. It can tunnel through obstacles and destroy items, so a thin wall is not permanent protection. The early warning is a sense-of-impending-doom moodle; closer proximity changes the warning and music. Those signals make noticing the creature before contact more valuable than waiting to identify its bite animation.

Why ordinary stun tactics disappoint

The entry describes extremely short damage stuns: two hundred damage produces only a tenth of a second. Escaping through a known route is consequently a better beginner plan than expecting repeated hits to hold the boss still. It can be slower than an unimpaired player yet still catch someone who stops to dig, fight or reorganize. Put obstacles between you and it when possible, while remembering that it can work through them rather than becoming permanently trapped.

Three phases change the decision

The current page describes an initial pursuit phase, retreat below 3750 health and a berserk phase below 2500. During retreat it runs away while it can see the player; after the second threshold it resumes a more aggressive pursuit. Damaging it until it retreats is therefore not the same as killing or permanently disabling it. If you intend to fight, use the lull to prepare rather than accidentally pushing it into the final phase without ammunition or a route.

Contact and aftermath

A hit can dismember an eligible limb and inflict severe pain and bleeding. The exact result depends on which limbs remain and the disfigurement setting; the old shorthand that every contact always removes the same limb is misleading. After a bite it normally retreats temporarily, but further impact damage can reset that respite. The current loot panel lists category items and body materials, replacing the vague description of high-value loot. Survival after contact calls for checking the health panel before resuming a chase.