Not sure I can pick just one, but here are a few I really like that weren't mentioned elsewhere in this thread:
Powder Mages: They can snort gunpowder as a performance-enhancing drug, burn gunpowder near them and redirect its energy however they like (one guy can fire two bullets at once, and burn powder on his person to adjust the trajectory of one of them in-flight). There are other types of magic in the series, but none as cool as powder mages, IMO. (Powder Mage trilogy by Brian McClellan)
Cradle series: Magical martial arts, with various "aspects" (elements, essentially; e.g. fire, water, light, dreams, earth, shadow, life, blood, etc etc), plus magical crafting using techniques left by deceased magic-users. This magic system eventually merges with a "higher" one based on willpower and "authority" (power over reality, achieved by embodying a concept). Follows an underdog main character who embarks on a quest to become strong enough to save his homeland from disaster. This series is incredibly good, but be warned: it'sextremely addictive. (Cradle series by Will Wight; only available on Amazon, sadly, but the first 3 ebooks are free right now in US/Canada!)
Without spoiling anything, the system that comes to be by the end of the Hyperion series is also really really cool.
Not sure I can pick just one, but here are a few I really like that weren't mentioned elsewhere in this thread:
Powder Mages: They can snort gunpowder as a performance-enhancing drug, burn gunpowder near them and redirect its energy however they like (one guy can fire two bullets at once, and burn powder on his person to adjust the trajectory of one of them in-flight). There are other types of magic in the series, but none as cool as powder mages, IMO. (Powder Mage trilogy by Brian McClellan)
Cradle series: Magical martial arts, with various "aspects" (elements, essentially; e.g. fire, water, light, dreams, earth, shadow, life, blood, etc etc), plus magical crafting using techniques left by deceased magic-users. This magic system eventually merges with a "higher" one based on willpower and "authority" (power over reality, achieved by embodying a concept). Follows an underdog main character who embarks on a quest to become strong enough to save his homeland from disaster. This series is incredibly good, but be warned: it'sextremely addictive. (Cradle series by Will Wight; only available on Amazon, sadly, but the first 3 ebooks are free right now in US/Canada!)
Without spoiling anything, the system that comes to be by the end of the Hyperion series is also really really cool.