That icewing in the prologue dies to Burn (1) along with the dragon still in the egg (2?).
When Scarlet kills Dune (3).
The sandwing that Peril kills in the arena while the dragonets are chained to the towers.
When Keatreal is on trial, the old dragon with no wings (4)(Perils friend, can’t remember name).
Tsunami kills her father, Gill (5).
The icewing that fought Clay, who Glory kills (6)(also can’t remember name).
I’m not counting the Icewings that died to all the Nightwings, cuz can’t remember how many.
Keatreal dies to Blister in the epilogue (7)
So 7-ish deaths from what I remember
