Just a small heads up,
one requested feature from before is that we be able to put traits on units through spells. In the last version of FE, some new tags were put in that does this.
<GameModifier>
<ModType>Unit</ModType>
<Attribute>UnlockUnitAbility</Attribute>
<StrVal>Water1</StrVal>
<Provides>Grants the Water Apprentice ability</Provides>
</GameModifier>
The modifier works as expected, ie, it "gives you the trait". And as any other trait, you can only have the trait once.
The trait can also be limited to this tactical combat only, in which case it disappears at end of combat.
<GameModifier>
<ModType>Unit</ModType>
<Attribute>UnlockUnitAbility</Attribute>
<StrVal>Water1</StrVal>
<Provides>Grants the Water Apprentice ability</Provides>
<Duration>-1</Duration>
</GameModifier>