There's a comment about Aid on ITL 162 that I find a bit puzzling.
Quote:
Other effects – like potions and Aid spells – are
cumulative with magic items, but only to the limit of 5.
You could have a DX +3 ring, and have a +3 Aid spell cast
on you – and both would help, but increasing your DX only
to +5.
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I have thought, in the past, that this was a Rule of Five limit to Aid -- that a six point Aid spell can only provide five points of benefit. But re-reading this (as I thought about Jack's tactic), I guess that's not so obvious. It explicitly mentions a limitation on Aid spells when one is gaining a similar benefit from magic items at the same time.
So, I guess that so long as the recipient is not wearing an attribute enhancing magical item, a single Aid spell can give as much benefit as the caster's ST.
I guess also that if one is wearing a ring of clumsiness, then he can receive six points of DX from Aid? A bit unusual...