because anything actually high tier need good mental stats and can easily get away with dumping any physical stat except maybe Con.
Here's your problem. "High tier." Casters being OP is a fact of the system, yes, but the game is built with the assumption that non-optimal build choices are made, of the sort that leaves casters pretty close to martials. The game's design assumes all ability scores are equal in value, so taking away a penalty means either adding a different one or reducing a bonus.
You know what expected build choices are? Healbot cleric, blaster wizard, skillmonkey rogue and meatshield fighter. It's the iconic party layout for a
reason. The heaps of power given to casters isn't intended, it's just a side effect of what was done to meet pagecounts and deadlines. Namely, default to easily made content, like spells and feats. The hard page-filling is in PRCs, where they can churn through 2-3 pages on one entry in about three hours, if that. Editing and checking for easy exploits probably comes
—
A thing I've started considering for no particular reason is replacing attempts at recreating various things from other media as base classes with sets of AFCs and non-class rules elements that accomplish the same role.
Stuff like repurposing Crusader into a Bloodborne Hunter based class. I took a three hour wiki binge because of being interested in lore based fluffsplanations and
god DAMN does Bloodborne fall apart when you give characters an idea of moderation. Seriously, the entire reason the Beast Plague is a thing
at all is because the people in Yharnam down multiple bottles worth of Blood Vials daily. Dozens to hundreds of Blood Vial equivalent per day. Sure, long term injury is fundamentally nonexistent, and conventional disease is probably not a thing... But look at the Beasts. I mean, I suppose if everyone had a Quicksilver Rifle to off any nascent Beast they ran into... And could pull the Blood Bullet trick... but that means giving everyone a rather powerful firearm and the means to make explosives from nothing but their blood. Goddamnit, now I need to bring this to one of the fic threads somewhere...
At any rate, Rallying can be replicated by the simple expedient of replacing Furious Counterstrike with an ability that restores health from the delayed damage pool. Thanks to Furious Counterstrike being an Attack roll booster, replacing it
also reduces the accuracy of attacks, so some of the precious accuracy needed to be consistently landing two or three attacks per round goes away, thereby significantly lowering the value of per-hit healing rates.
The situation with Quicksilver Bullets, the Bloodtinge scaling Trick Weapons(the two have
significantly different mechanics from eachother) and the Visceral Attack Caryll Rune effects(translated to conditional Strikes/Counters) can be used for a decidedly vampiric Discipline that can be carried on an AFC that trades Devoted Spirit and Knowledge(History) for it and Knowledge(Arcana).
Caryll Runes and Blood Gems are obviously added types of item, but an interesting thing that can be done with them is having Caryll Runes be able to take the place of a variety of subsystem access points. Such as a Psion trading a Power Known to get a permanent bonus. Blood Gems are mostly just another socket system, but the
theme means that you can bring in Con or HP costs instead of XP. Sockets are kinda boring, though...
The remainder of the Trick Weapon system can be covered by a slightly abnormal double-weapon system. Not just mode swapping, because transformation attacks are a pretty major thing with Bloodborne combat. There has to be
some level of involvement, with that, which needs a level of granularity that 3.5 just doesn't have. Simple solution, though. Just toss it into Full Attacks and pre-Attack or mid-Attack Swift and Move actions. For the most part, this just means making a tradoff of some kind on an attack for the transformation. Or the item's price counts the advantages of the swap as an at-will ability.
...Does this cover all the basic stuff out of Bloodborne? What do you think about the ideas I drabbled out? ...not counting the second paragraph of this segment, which is basically a mini-rant about Bloodborne's plot requiring utterly bizarre amounts of excess and how the issues could be sent sideways.