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The celestial pact's heavenly body ability and the blood of angels ability that replaces it for the Agathion subpact both grant 1/2 Con bonus as an increase to save DCs for pulses and clauses, but the bonus is a Sacred bonus for the base pact, and a direct application of the halved ability bonus to that DC for the subpact. Is this intentional?

Is there any chance of getting the Aspirant a clause that allows Embodiment of Aether to also switch strength in place of charisma for determining rounds per day of aspiration form?

Nation Pact > Pact Empowerments > Squad Tactics: "You may only it once per round, however." missing a word, probably "use" after "only"
"then make an attack as if by your on my command ability." capitalization of the On My Command ability
"At 18th level, you can affect up to three allies when you use activate on my command as a standard action." redundancy: "use activate" should be either "use" or "activate. also, capitalizatin of the On My Command ability

Nation Pact > Pact Empowerments > True Patriot: "such selling state secrets" missing a word, probably "as" after "such"

Old One Pact > Pact Empowerments: heading says "One One" instead of "Old One".

Clauses > Aether Lance: "When you do, you attack with an aether lance at the end of the charge instead of making a normal weapon." missing a word, probably "attack" after "weapon4

Clauses > Least Clauses > Lock and Key: Does this still detonate and deal damage if the arcane lock is opened "properly" (ie, by the caster)?

Clauses > Lesser Clauses > Insectile Transformation: Is there a particular reason you had this use a version of Beast Shape modified to use vermin forms instead of simply using a Vermin Shape spell in place of a Beast Shape one?

Clauses > Greater Clauses > Maddening Pulse: "A creature damaged it must succeed" missing a word, probably "by" after "damaged"

Steel's Betrayal (Combat) feat: This is, at most, one point of damage gained per one point of attack bonus effectively lost. Power attack is twice that, and is still underpowered. The problem, with both of these feats, is that the cost of losing attack bonus is proportional to the amount of damage dealt (or other benefit gained) per hit. Thus, things like Steel's Betrayal and Power Attack are decent at very low optimization levels, but the better the rest of your build is, the more these two feats suck, and the rest of your build doesn't have to get all that good for these feats to start sucking pretty bad. This also means that these are feats only supportive of a martial striker role, that are at their worst on a martial striker build.