Here is a list of directional shards that are affected by Ambivalence
These were all tested on the bone morte outside of Arrantville.
Flame Cannon
True Arrow
Inferno Breath
Chaser Arrow
Flying Dagger
Teps Oceus
Aqua Stream
Acid Jet
Venom Mist
Flamethrower
Chisel Barrage
Riga Dohin
Fald Ciu
8-bit fireball
Some interesting things to note:
One thing I noticed was that fire spells did not get an attack boost with the light ambivalence but did get a decrease in attack power when converted to dark
Fald Ciu is a dark spell normally but did increased damage when converted to light
The two poison shards did more damage by themselves without Ambivalence but the light whip still does more damage than the dark one as expected