Am I interpreting this correctly?:
Blood of Fiends pages 18-23 are PFS allowable presuming you hold the Tiefling Boon.
The Rakshasa-Spawn trades the standard tiefling ability mods for +2 Dex +2 Cha -2 Wis, trades the Skill modifiers for Disguise and Sense Motive, and trades the spell like ability Darkness for Detect Thoughts. Those things that aren't overwritten or specifically listed as being part of the exchange, (Fiendish Resistance, Fiendish Sorcery, and Languages), remain unchanged.
This looks straight forward to me. Is there something I'm missing?
I've never considered playing a sorceror. I'm too much in love with the multitude of mage options. Having said that, I'm looking at:
"Bloodline Arcana: Whenever you cast a spell of the
charm subschool, increase the spell’s DC by +2" as part of the Infernal heritage
+
Spell Focus:Enchantment
->
'Charm Person' at first level with a DC of 20.
Of course, an actual Cha of 22 doesn't hurt things after you have already charmed someone.