@Arioch
A couple of things to think about regarding Templars and aligning a class to them in newer editions of D&D
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Look at the 5E classes now (2024) and see how those classes fit the original theme of the templar as several classes did not exist or have changed dramatically from 2E.
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Compare the statements in the original books to see what themes remain.
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In the original Templar write-up, other than spells & controlling undead, all the abilities of the templars are secular and temporal – nothing mystical. Look at those 5E mechanics (skills/expanded spell lists, feats, etc) that can mimic those 2E abilities in the 5E ruleset?
Here are sample 5E2024 classes written as if they applied to a Templar. Let me know which one of the three sound most fitting for a Templar.
1. Templars draw power from the realms of the gods and harness it to work miracles. Blessed by a deity, a pantheon, or another immortal entity, a Templar can reach out to the divine magic of the Outer Planes-where Sorcerer-Kings dwell-and channel it to bolster people and battle foes.
Because their power is a divine gift, Templars typically associate themselves with temples dedicated to the deity or other immortal force that unlocked their magic. Harnessing divine magic doesn’t rely on specific training, yet Templar might learn prayers and rites that help them draw on power from the Outer Planes.
2. Templars are united by their oaths to stand against the forces of annihilation and corruption. Whether sworn before a Sorcerer-King’s altar in a sacred glade before nature spirits, or in a moment of desperation and grief with the dead as the only witnesses, a Templar’s oath is a powerful bond. It is a source of power that turns a devout warrior into a blessed champion. Templars train to learn the skills of combat, mastering a variety of weapons and armor. Even so, their martial skills are secondary to the magical power they wield - power to heal the injured, smite their foes, and protect the helpless and those who fight at their side.
A Templar tries to hold to the highest standards of conduct, but even the most dedicated are fallible. Sometimes a Templar transgresses their oath. A Templar who has broken a vow typically seeks absolution, spending an all-night vigil as a sign of penitence or undertaking a fast. After a rite of forgiveness, the Templar starts fresh. If your Templar unrepentantly violates their oath, talk to your DM. Your Templar should probably take a more appropriate subclass or even abandon the class and adopt another one.
3. Templars quest for knowledge that lie hidden in the fabric of the multiverse. They often begin their search for magical power by delving into tomes of forbidden lore, dabbling in invocations meant to attract the power of extraplanar beings, or seeking places of power where the influence of these beings can be felt. In no time, each Templar is drawn into a binding pact with a powerful patron.
Drawing on the ancient knowledge of beings such as the Sorcerer-Kings, Templars piece together arcane secrets to bolster their own power. Templars view their patrons as resources, as a means to the end of achieving magical power. Some Templars respect, revere, or even love their patrons; some serve their patrons grudgingly; and some seek to undermine their patrons even as they wield the power their patrons have given them.
These are excerpts from the original boxed set.
Templars worship the sorcerer-kings and draw their magical energies through them. The sorcerer-kings grant magical spells to their templars for services rendered. (OBS-RB pg29)
A templar’s spells are received directly from the sorcerer-king he worships. (OBS-RB pg34)
Templars draw their magical powers through their sorcerer-kings**, who in turn draw upon the Negative Material plane** (OBS-RB pg 70)
Templars are clergymen devoted to the sorcerer-king of their city. Like other priests, they are granted spells in return for their worship. Unlike true priests, who draw their power from the elemental forces of the world, Templars tap into the magical forces of their sorcerer-king. When a templar beseeches his monarch for a spell, the sorcerer-king grants the request by employing his own mystical energy to power the templar 's magic. Because of the strain this places on both the sorcerer-king and the surrounding land, young templars do not ask for (or receive) many spells. (OBS-WJ pg13)
Clerics worship one of the four elemental planes: earth, air, fire, or water. They call upon magical energies from those planes, specializing in one element’s magical applications on the prime material plane. (OBS-RB pg29)
Druids A druid will ally with a particular spirit, acting as that spirit’s earthly counterpart, drawing his magical energy from the spirit in question. (OBS-RB pg29)