An ideia for that could be that of an chance on crit/hit to summon an Draconic Echo (or Ashelander) if there is none of the latter already on the party's side of the battlefield.
Wich will have an Encounter ability (probably an At-Will aswell) similiar to Psionic Infiltration (this could have an turn delay by using the Multi-Turn ability, Spectral Dragon Breath/Blast?) that auto-destroys/consumes itself, so to simulate the echo vanishing away after certain time.
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