Based on HT or Will

Based on HT or Will is a +40% enhancement found on page 9 of Beyond the Pale.
It is based on the Based on (Different Attribute) enhancement from B102, which is normally +20% to shift it from the base attribute to a different one.
That is normally mandatory in 4e, although in theory Selectivity would be able to turn it off and put it back to the normal one.
P100 initially argued against that:
*If the GM permits, an attack can have several instances of this enhancement, letting the user choose how his attack is resisted
*Each attribute – including the one that normally resists the attack – costs +20%.
That would mean instead of Based on Will +20% Selectivity +5% you'd need to take "Based on Will +20%" and "Based on HT +20%".
Initially, this required prespecifying:
*The attacker must choose the target attribute before he attacks.
This was very restrictive, as it would require estimating which was the correct attribute to target, which could be unknown and involve metagaming.
Another problem is that this violated the "can be used simultaneously" aspect of enhancements.
BTP's approach thus is more in the spirit of how it ought to work: when bought at full price, it uses the LESSER OF THE TWO.
The "Quick Contest of Will against the lower of the victim’s HT or Will" of The Drawn is presumably a rewrite and retcon of how the 'Based on' family of enhancements work.
P100's "must choose .. before" guidelines would be better represented as Alternative Enhancements.
PU4p13 effectively adds selectivity to whichever enhancements are in it. This could be cheaper, since it might cost as little as +1% extra just to get a 'token other enhancement' which you switched to, to get the first one to turn off.
"Alternative Based on Will or Reliable +1" for example, would cost +21% and when using Reliable +1, you could not base it on the Will roll, and thus it would default to the usual HT.
"Alternative Based on Will or Based on DX" on the other hand, would be +25%, and this would not allow reverting to the unmodified HT roll since all aspects of the alternative require shifting away from it.
==See also==
*Based on lower of HT or Will
Category:Enhancements