User blog comment:Cfp3157/Percy Jackson vs. Harry Potter/@comment-222.127.174.119-20131029144910/@comment-422690-20131029145811

I'm fairly sure Harry has never been shown to use fiendfyre, and his patronus is effective against dementors and not much else (save, perhaps, an Iezu who feeds on fear - but that's another universe entirely.). It shuuld be noted, however, that Harry does have access to his list of spells for the time period he's from; it's explicitly forbidden to limit such natural abilities.

The absence of the Apparition or Sectum Sempra can be given by time period Cfp's puled Harry from, though that's not made clear. Using warriors from different periods in their lives is not considered limiting their natural abilities.

As for the Elder Wand or the Invisibility Cloak, those are equipment and not his innate magical abilities; it could be simple balancing, or just personal preference. That one I'll leave entirely to Cfp.