As in, by level 20 he's killing demigods and divesting them of their divine rank.
The plan is as follows:
1. Use that trick where you are completely undetectable by anyone (it involves Vecna-Blooded, and I can't remember the rest.)
2. Boost SA to outlandish degrees. I'm thinking something approximating PBMC's record SA build, along with some items with spells like Hunter's Eye at CL 20th inside them. Craven and Deadly Precision are nifty too.
3. Invest in Thinaun daggers so that those pesky demigods can't be resurrected and/or reform from that SDA. I want them dead, damn it!
4. Invest in an item of Ice Assassin. You know the drill from there.
5. Once I have a Divine Rank, I'll go ahead and grab Divine Sneak Attack and the SDA that makes you always win Initiative. So I can SA those demigod bastards more efficiently.
Some drawbacks I must consider:
1. Some deities have Battlesense, and so cannot be flanked. I will not deal with these, instead waiting until my Divine Rank is higher than their's, so I can either use Hand of Death, Life and Death, or Mass Life and Death on them. Either that or just SA them.
2. Deities have a lot of health. I will remedy this by playing as a Venerable Dragonwrought Kobold (If and only if this doesn't interfere with Vecna-Blooded), acquiring a familiar, and performing the old Embrace/Shun those temporary Alertness into that epic feat that boosts SA damage trick. NI SA dice should kill just about anything.
3. Higher ranked deities will not be happy about this. I don't know about how to avoid this, other than dumping 5d6 SA dice for 5 levels of Exemplar, and then using my outrageously buffed Hide Check to make deities not want to kill me. That sounds pretty nice to me.
Other than the cosmic imbalance caused by mass deific murder, can you spot any other problems? Basically, when I'm done harvesting demigods, I should have a high enough Divine Rank to destroy any gods that go against me.
<Sarcasm>This will show them. Imagine, they actually were calling me OP and a powergamer.<Sarcasm>
Note: This is all a theoretical exercise until I find a DM stupid/forgiving enough to allow me to play this kind of character. I hope I never get to.