Umbral Scion, Encroaching darkness cover and light?

[LordDraco III]

So their are 2 questions
#1 What is the spell level of the affect and for that matter does it even have one when overlapping in an area of a spell like daylight?
#2 At 14 level it provides cover, which reads rather oddly does this mean cover as in +4 Bonus to AC to everything and nothing can make attacks of opp? Or is this referring to cover as it is relevant to darkness and lighting for making stealth checks
The Archytype Umbral Scion.

Ability in question:

Encroaching Darkness (Su)

An umbral scion is capable of influencing light around her. As a standard action, she can produce a 10-foot-radius veil centered on a creature or object within 30 feet. This veil decreases the light level by one step and remains for a number of rounds equal to the sorcerer’s Charisma modifier.

At 7th level, the veil increases to a 30-foot radius. At 8th level, the veil decreases the light level by two steps. If the light level is decreased past darkness, the veil is treated as deeper darkness.

At 14th level, the veil increases to 60 feet and grants any creature within it cover (even against senses normally able to penetrate total darkness, such as the see in darkness ability).

An umbral scion can use this ability a number of times per day equal to 3 + her Charisma modifier.

This ability replaces the shadowstrike bloodline power.

[Isaac Zephyr]

RAW, it has no spell level. Is is a Supernatural (Su) ability, not Spell-like (Sp). This means in an area of Daylight or another such light spell, it still lowers the level by one. They don't cancel like the description in Daylight or Darkness/Deeper Darkness.

It seems to be referring to cover as provided by darkness, as it references senses pertaining to sight in parentheses. The issue is, that's concealment, not cover, and the PFSRD links to combat cover. If it does function as cover, the problem is two-way though, as you and your allies would have cover in it, yes, but so would your enemies without a way to pierce the darkness.

As a (Su) ability however, it has no spell level, so Faerie Fire would work fine within, negating this drawback to the ability.