An ancient post that has been sitting in my drafts for, maybe a couple years. At one point this would be my mash-up D&D rules. But now, I don't even remember what some of these rules are... Some of them sound intriguing.
OD&D: The castle rules from Book 3.
Holmes: Scroll creation for low level magic-users.
B/X: The baseline system for everything.
AD&D (both editions): Hobbits being mostly thieves, dwarves being clerics (so, now like the Elf being a fighter/magic-user, the hobbit is a fighter/thief, and the dwarf is a fighter/cleric).
BECMI/RC: Thirty-sixth level characters and fighter combat options.
D&D3: Interestingly enough, this turns out to be a tough one. Feats are covered by DD and if I wanted skills I'd use the DD system as well.
Type IV: It's Manual of the Planes, the one bit of assumed world I liked from it more than prior editions.
LotFP: The encumbrance system, attack modes for fighters, and the parry option. If I used my charlatan class (magic-user/thief combo) I'd base their player's company name level rules on the inn rules.
BX Companion: The high level thief traits. Possibly the mass combat rules.
ACKS: Ritual spells, high level magic user abilities (creation of half-breeds), cleave rule (for fighters only), and mortality table.
Dark Dungeons: Weapons feats and spell training/research rules. Thirty-sixth level demi-humans (I know they're an option in RC but DD assumes their use).
Neo-Classical Geek Revival: The various exploration and travel XP awards.
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