Add a unique Song to Gjallarhorn, eg, Massacre Elegy.

Every other Mythic/Relic has gotten a boost at Lv90, enough a boost in most cases to make them on par/better than Empyrean Counterparts outside of Abyssea...except Gjallarhorn.

+3 to all songs (and even if it was +4, +5, etc) is not enough and largely an irrelevant factor. The only time its +40 skill comes into play is for Scherzo (also the same place the +3 currently comes into play, and to a smaller degree with Marches). +3 (+4 w/AF3+2) Ballads are also not a worthy enough boon for a Gjallarhorn with large amount of refresh that can be gained by non-Gjallarhorn BRDs (9/tic) sub-RDM (3/tic) idle (varies, but usually at least 3/tic) and RefreshII (Minimum 6/tic).

tl:dr

-7% Damage Taken on attacks that would consume 75% or more of your HP, or 32/255:Magical Haste is hardly a boon worthy of what the Gjallarhorn is, its relic counterparts, and the time it takes to create one.

Make Massacre Elegy a Gjallarhorn specific song, make Gjallarhorn a worthwhile relic again.