Let's give this a whirl. I'm opting for a slightly easier version of the extended spell durations, so see what you think.
Delay Damage (Su): Any effect takes a full round to affect a cryptknight. For example, weapon damage done to a cryptknight applies one round after the successful attack. Similarly, a spell affects a cryptknight one round after it normally would (a fireball targeting an area including a orc and a cryptknight would damage the orc immediately but the cryptknight one round later). This also applies to nondamaging effects.
Spell Extension (Su): Any spell effect with a duration other than concentration, instantaneous, or permanent is doubled (as by the extend spell metamagic feat) in its effect on a cryptknight. That is, a spell with a one round effect would last for two rounds. In addition, the effect of the spell begins one round later than usual (see Delay Damage).