Does anyone know how to get the final CG? When I talked to the boss with the Dark Elf she just killed him instead of doing the CG.
At the very beginning of the game, behind where you start, there's a stone that says "The final trial will test 'a body pushed to its limits' and 'a heart three times a tenth-part full.'" My interpretation of that was that you had to get the apostle down to about 3/10 of their morale and have the body modification done before encountering the boss at the end. I'm sure that you need the body modification, since that's used in the last CG, and I don't know exactly how low you need to get her morale, but when I hit the boss with the apostle at a bit over 3/10 of her morale and with the body modification having been done, I got the last CG, and with previous attempts, I didn't.
Since most trap combos really don't do much damage to the apostle's morale, and it's wasteful to do more than one trap at a time once the apostle's armor is gone (since each trap costs mana, and the main thing you need is the orgasms, not the small morale hit), the best way I found to get her morale down was to use the catapults in the room where the horse appears. You have to be careful not to completely destroy her morale (since if you hit all 4 catapults, it doesn't take more than 2 or 3 traps leading up to the teleport that took you to the catapults before the damage level is high enough to defeat her). However, it makes it trivial to do a lot of damage, whereas most trap combos do relatively little, and trying to wear her down over time is a waste of time.
Interestingly enough, as a bonus of sorts, I found that if you defeat the apostle with either the horse or the tit pressing board, you get different dialog from her in the sex scene (she then mostly enjoys it instead of complaining), and I think that in the case of the horse, the CG was slightly different too, but I'm not 100% sure on that one. Either way, I got something extra out of screwing up and defeating her early that way. However, I don't know if any other monsters give different dialog when you use them to destroy the last of here morale. It doesn't happen with the breast rape monster that you find in the room where the horse shows up, and for most of the monsters, it's pretty hard to get a good enough combo to finish her off. So, I haven't tested any of the others yet.
