>>58630506well it was definitely a gradual descent before lys went off the deep end. he gave too much and people kept taking, he genuinely liked helping people and sincerely wanted to make the world a better place, but all he began to see were his efforts being taken advantage of and baring little to no fruit, and he was too focused on the bigger picture instead of the smaller efforts.
he likely started closing himself off from the people who cared about him more and more over time, sycamore implies as much towards the end of XY when apologizing to calem/serena and not speaking to lysandre sooner. nobody tried reaching out to him or noticed as he continued to spiral, being surrounded by his literal yes men at team flare just fed into his delusions until he reached his breaking point in XY; by the time of the final confrontation with him he's incredibly emotionally unstable and way too far gone.
then the weapon blows up, taking him with it. god knows what kind of state he was in until zygarde rescued him.
>"the agony of being unable to die"can have several implications, especially since it's only been five years at that point in ZA, he probably was severely mutilated, not to mention traumatized, and wanted nothing more to die at the point where zygarde saved him. part of me wonders how much of those five years were spent just of him recovering physically. he's also been wrestling with all of that trauma and pain, not even knowing why what happened happened, just that he was the one responsible for attempting such an evil atrocity and disaster, and knowing he will be atoning for that for the next 3000 years.
he definitely has some closure and peace by the end of ZA after regaining more of his memories and being able to confront them, beginning to atone for some of his actions by helping zygarde and protecting luminose from something he was partially responsible for, but he still has a long way to go to work through all of his issues, and a literal eternity for it.