Only the paladin is marking the enemy in my scenario. Everyone else is giving the attack penalty through Psychic Lock and either a psychic power or the gith sword.umm...marks don't stack, they override, and the -2 penalty from marking is only if you attack someone other than the one marking you. And it only applies to its next attack roll. Not that big a deal to someone who makes multiple attacks.
Only the paladin is marking the enemy in my scenario. Everyone else is giving the attack penalty through Psychic Lock and either a psychic power or the gith sword.
I did miss that Psychic Lock only affects your next attack roll. But still, neutering even 1/5 of an enemy's attacks (and very, very few solos get 5 attacks a round) is a powerful debuff, which seriously decreases the danger of the encounter.
Oh, I do worry about the psionic classes. Keeps me up at night.Well, you do have to hit first and the PCs that would most benefit from the githyanki sword are not likely to have the Psychic Lock feat given their power selection. I'd be more worried about the abuses of the psionic classes then I would be a silver sword.
Penalties already don't stack with themselves: "Unlike bonuses, penalties don't have types. Penalties add together, unless they're from the same power. If two monsters attack you with the same power and each causes you to take a penalty to a particular roll or score, you don't add the penalties together; you take the worst penalty" (PH 275). I would assume the example generalizes to two PCs bestowing penalties from the same feat.Seriously, though, I think the problem is just that Psychic Lock is too exploitable. It should be errata'd to not stack with itself, that would be a good start at making it more resaonable.
This.Penalties already don't stack with themselves: "Unlike bonuses, penalties don't have types. Penalties add together, unless they're from the same power. If two monsters attack you with the same power and each causes you to take a penalty to a particular roll or score, you don't add the penalties together; you take the worst penalty" (PH 275).