How does Svellsongur interact with Deathknell abilities, both on units and on equipment attached to those units?

Ruling: Svellsongur copies Deathknell abilities that are part of a unit's printed text, but does not copy appended rules text from equipment or other sources.

Sequence:

• If Svellsongur is attached to a unit with printed Deathknell (e.g., Watchful Sentry), when that unit dies, both the original Deathknell and Svellsongur's copy trigger
• If Svellsongur is attached to a unit that has Deathknell from equipment (e.g., Sacred Shears), only the equipment's Deathknell triggers, not a copy from Svellsongur

Nuances:

• The design intent is that Svellsongur does not copy appended rules text from any source