Every time you rank, you should see a message that tells you what spells/skills you get. But you don't get it equipped it immediately.
at level 16, you have 3 spells that can give you xp back
exaltation at level 2, 10 minute timer
damnation at level 10, 1000TP, 4 sec timer
Stygian spikes at level 16
Not sure how you floor your xp...you are doing something wrong on how you fight those mobs
Mikayla Soulfire (XIV), Ul'dah, Istory Lodestone Profile
Mikael (XI) Bastok, CaithSith
Thus is our agreement written, thus is treaty made. Thought is the arrow of time; Memory never fades. What was asked is given; The price is paid.