He spends most of the time alone, wearing the +6 Splendour headband and using no other enhancements, even as spells. If the nice comforting deadline has been removed on how long he needs to hold himself together with solder and duct tape, then he needs to recover and put himself together now that he's in time dilation...
Is his will failing, here? Possibly. Being able to keep up a storm of work for three months on Project Lawful when everything is going great and you are having fun and in a lot of supportive relationships and your problems are fundamentally way way easier, is not the same as being able to work continuously under his current conditions. Even with a +6 Belt of Mighty Constitution.
He will, if he gets a look at Carissa's wall or checks in with her on what she's thinking about, remind her that she cannot plan to threaten Pharasma by proxy. If she expects himto threaten Pharasma successfully, and prefers that outcome, she cannot help him with that in any way. Carissa can try to reduce associated harm to herself and Pharasma, maybe, if her method doesn't hinder his plans, but she can't plan to threaten Pharasma. That is the whole reason why Good couldn't do this earlier.
The fact that she came up with her plan to delay Cheliax's invasion and give him more time to work, while still in utter horror at his plans generally, is helpful. That shows Carissa wasn't threatening Pharasma by proxy, in trying to give him more time to work.
But if she's started thinking there's a case for being less than utterly horrified with all this, that is going to require him to be much more careful in considering Carissa's further suggestions to make sure that they benefit Pharasma as well as himself.