I'd planned to finish off MC13 first. I have the guardian "on deck" once the others have a last chance to comment on the artists.
They ought to be stronger, more dexterous, and hardier than efreet... but do we dare give them a +10 natural armor? Perhaps a Deflection bonus to their Armor Class? I've only seen those bonuses occasionally, and don't quite remember if Deflection bonuses are only for certain types of creatures.
Maybe bigger damage dice. Certainly they ought to have the Improved Initiative and Multiattack feats, possibly Alertness but we can easily devote a nice chuck of the Skill Ranks to Listen, Search, and Spot as well as racial bonuses.

They ought to get the benefit of something like Ubiquitous Vision, possibly as a supernatural ability:
...In effect, you have a 360-degree sphere of sight, allowing you a perfect view of creatures that might otherwise flank you. Thus, flanking opponents gain no bonus on their attack rolls, and rogues are denied their sneak attack ability because you do not lose your Dexterity bonus (but they may still sneak attack you if you are caught flat-footed). Your Spot and Search checks gain a +4 enhancement bonus. Concurrently, you take a -4 penalty on saves against all gaze attacks during the power’s duration.
Do we simply make it a Glyph of Warding? Or do we bother to convert it into something?Level: 2 (priest spell)
Sphere: Guardian [Evocation]
Range: 30 yards
Components: V, S, M
Duration: Up to eight hours
Casting Time: 5
Area of Effect: 10' radius
Saving Throw: Negate
This spell is known as wyvern watch because of the insubstantial haze brought forth by its casting, which vaguely resembles a wyvern. It is typically used to guard some area against intrusion. Any creature approaching within 10 feet of the guarded area may be affected by the "wyvern." Any creature entering the guarded area must roll a successful saving throw vs. spell or stand paralyzed for one round per level of the caster, until freed by the spellcaster, by a dispel magic spell, or by a remove paralysis spell.
A successful saving throw indicates that the subject creature was missed by the attack of the wyvern-form, and the spell remains in place. As soon as a subject creature is successfully struck by the wyvern-form, the paralysis takes effect and the force of the spell dissipates. The spell force likewise dissipates if no intruder is struck by the wyvern-form for eight hours after the spell is cast.
Any creature approaching the space being guarded by the wyvern-form may be able to detect its presence before coming close enough to be attacked; this chance of detection is 90% in bright light, 30% in twilight conditions, and 0% in darkness.
The material component is the priest's holy symbol.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.