From the UESP Eso Skill Browser
Summon Shade
$1 = 0.03003 Magicka + 0.00001 SpellDamage - 0.95708
Magicka, R2 = 1.00000, Ratio = 0.00
Dark Shades
$1 = 0.03003 Magicka + 0.00001 SpellDamage - 0.95708
Magicka, R2 = 1.00000, Ratio = 0.00
Shadow Image
$1 = 0.04004 Magicka + 0.00010 SpellDamage - 0.86677
Magicka, R2 = 0.99999, Ratio = 0.00
This skill has absolutely terrible spell damage scaling compared to other spells in the game. Serously 0.00001 spell damage, thats nuts. Playing with my in-game tooltip and stats the UESP values appear to me to be correct.
Is this skill bugged, or is it just intended to be terrible?