Mageknight

One of the many classes introduced in Spheres of Power, Mageknight is (unsurprisingly), a Gish class. Like most Spheres based classes, it boasts a high level of customization, with most class features being chosen by the player (their talents are gained at every even level and called "mystic combat"s) and are fairly generic without taking an archetype (for which they have many). As low casters (Half Caster), they are intended to be martial characters with some magical tricks, rather than potent casters themselves.

Like most Spheres classes, their tier is a bit difficult to pin down due to their level of customization raising the question of what "optimization neutral" puts them at. Their low CL making Legendary Talents effectively capstone only aside from Life (which they can take a mystic combat to make work for them as a Full Caster for that sphere only) and limited magic power will generally keep them out of tier 2 well optimized spherecasters with Legendary Talents allowed can reach. They most likely belong to tier 3 and 4.

As this class was quite basic at its core, it does have access to a broad number of archetypes.

• Dragoon sacrifices a few defensive features for an animal companion, one that can also benefit from Mystic Combats.
• Knightknight turns a low-caster to a mid-practicioner in Spheres of Might, as befitting a class that sacrificed the "Mage" part of Mageknight (and yes, this is from a book full of bad gag archetypes). On top of gaining a Cavalier order and a special mark that's akin to a challenge (both from the Cavalier and the Challenge part of the Guardian sphere), they also gain a special pool of points that can be used for any non-casting Mystic Combats and can recharged quite quickly.
• Martial Controller is a Champion combines the wards of the Protection sphere and the Patrol part of the Guardian sphere in order to make a character that has superb area control by attacking anyone that trigger the wards.
• Martial Mageknight is the mandatory barebones Champion archetype that gives access to Spheres of Might without sacrificing anything.
• Resizer loses plenty of class features, instead gaining an exceptional focus on the size-changing abilities of the Alteration sphere.

5E

As part of the 5E port of the Spheres system, the Mageknight was ported over with the Martial Mageknight archetype being built-in. While losing out on Mystic Combats due to the very simplified progression of 5E, the Mageknight doesn't just gain the fighting styles given to fighters and paladins, but also the ability to attack after casting if you spend Martial Focus. As with other 5E classes, you have a list of subclasses to select, each one giving extra talents from two focus spheres:

• Armorist is carried over from the PF version, this allows them to summon and enhance weapons and armor from the ether through the Creation and Enhancement spheres. That said, this equipment must be sustained by concentration as the enhancements are considerably more powerful than they were in Pathfinder.
• Psionicist is something akin to the Symbiat with its focus on the Mind and Telekinesis spheres. While the self-buffing features persist, they don't get any group buffs and instead get a pool of temp HP that can be refilled by spending points on powers.
• Spellblade is a bit basic, with a focus on the Protection and Destruction spheres. They gain temporary spell points by killing enemies and make enemies they hit more vulnerable to powers.
• Skinwalker is the 5E answer to the Shifter. On top of a focus on the Alteration sphere and a lesser one on the Life sphere, there's the improvements to shapeshifting up to the ability to permanently gain a trait from transforming.

The Third Party Classes of Pathfinder
Psionics:	Psion - Psychic Warrior - Soulknife - Wilder Aegis - Cryptic - Dread - Marksman - Tactician - Vitalist
Path of War:	Stalker - Warder - Warlord - Harbinger - Mystic - Zealot
Akashic Mysteries:	Daevic - Eclipse - Guru - Nexus - Radiant - Rajah - Stormbound - Vizier - Zodiac
Spheres of Power:	Armorist - Elementalist - Eliciter - Fey Adept - Hedgewitch - Incanter Mageknight - Shifter - Soul Weaver - Symbiat - Thaumaturge - Wraith
Spheres of Might:	Armiger - Blacksmith - Commander - Conscript Savant - Scholar - Sentinel - Striker - Technician
Spheres of Guile:	Agent - Courser - Envoy - Mastermind - Professional
Champions of the Spheres:	Prodigy - Sage - Troubadour - Dragoon - Mountebank - Necros - Reaper Warden - Crimson Dancer
Pact Magic:	Pactmaker (formerly known as Medium)