Just in case people are having trouble figuring out the timing of Xanadu's two armor moves, I recorded a couple of clips to illustrate when exactly the armor property is active for.
For his st.C the armor activates just as he start extending his elbows for the palm trust, and I believe it's active all the way up until the move is about to hit, or a frame or two before that. This makes it so you have to be preemptive with it to utilize its armor properties, but still fast enough to use against jump in's or a baited wake up reversal move in the corner (though against jump in's his amazing cr.D is honestly a better and more reliable choice, and can of course lead to combos). https://twitter.com/chrisunivrs/status/769835765396373504
His st.D only has armor towards the end of the move, just as he's about done extending his head and until it hits. So basically you wanna think of it as him using his chrome dome to headbutt fireballs out of existence, as that's basically what it looks like :P. It's pretty great for getting in against somebody throwing fireballs at you, but as the active armor frames on this seems fewer than on his st.C it can take some training getting used to the spacing. https://twitter.com/chrisunivrs/status/769836188328919044
Lastly, I thought I'd point out that these aren't just single hit armored moves, but multi hit armored moves. Not only that, but unlike armored moves in many other fighting games (dunno about past KoF titles as I've only ever played them very casually) you don't armor through but still take damage or potential damage (white life), you actually take no damage. Meaning you're effectively invincible during these armored frames (even though I guess they wouldn't technically be called invincible frames since they have a special effect to them when hit). Just for the heck of it I recorded a clip showing of the multi hit armor of both moves as well https://twitter.com/chrisunivrs/status/769843042484359168
I hope somebody might find this useful, and thanks to OP for all the great info on Xanadu in general; I learned a lot from it .
For his st.C the armor activates just as he start extending his elbows for the palm trust, and I believe it's active all the way up until the move is about to hit, or a frame or two before that. This makes it so you have to be preemptive with it to utilize its armor properties, but still fast enough to use against jump in's or a baited wake up reversal move in the corner (though against jump in's his amazing cr.D is honestly a better and more reliable choice, and can of course lead to combos). https://twitter.com/chrisunivrs/status/769835765396373504
His st.D only has armor towards the end of the move, just as he's about done extending his head and until it hits. So basically you wanna think of it as him using his chrome dome to headbutt fireballs out of existence, as that's basically what it looks like :P. It's pretty great for getting in against somebody throwing fireballs at you, but as the active armor frames on this seems fewer than on his st.C it can take some training getting used to the spacing. https://twitter.com/chrisunivrs/status/769836188328919044
Lastly, I thought I'd point out that these aren't just single hit armored moves, but multi hit armored moves. Not only that, but unlike armored moves in many other fighting games (dunno about past KoF titles as I've only ever played them very casually) you don't armor through but still take damage or potential damage (white life), you actually take no damage. Meaning you're effectively invincible during these armored frames (even though I guess they wouldn't technically be called invincible frames since they have a special effect to them when hit). Just for the heck of it I recorded a clip showing of the multi hit armor of both moves as well https://twitter.com/chrisunivrs/status/769843042484359168
I hope somebody might find this useful, and thanks to OP for all the great info on Xanadu in general; I learned a lot from it .