Guitar Melody - BUFF_SPECIAL_MOVE
<skill id="11520" toLevel="5" name="Guitar Melody">
<!-- For $s1, party members' Atk. Spd. +$s2, Casting Spd. +$s3, and Speed +$s4, and Skill MP Consumption -$s5. -->
<abnormalType>BUFF_SPECIAL_MOVE</abnormalType>
Lute Melody - BUFF_SPECIAL_MOVE
<skill id="11522" toLevel="4" name="Lute Melody">
<!-- For $s1, Atk. Spd. +$s2, Casting Spd. +$s3, and has a chance of applying $s4 Vampiric Rage. -->
<abnormalType>BUFF_SPECIAL_MOVE</abnormalType>
This bug persists on all GoD+ chronicles and on Ertheia Guitar Melody was changed with BUFF_SPECIAL_DEFENCE and it's working.