Namely, I'd like to know if the +20 to your next attack roll with True Strike is applicable to either of the Perfect Strike rolls, at your discretion, or if you are forced into it applying on the first roll of Perfect Strike?
2 Answers
You add it to both
Perfect Strike allows you to roll "your attack roll", the thing True Strike modifies, twice; It does not cause you to make two separate attack rolls. Since it is a single roll rolled twice you get the +20 to both rolls. In the odd event you roll a critical threat with one of the rolls you still add the +20 to the other roll that is now your critical confirmation roll because it starts off as 'your attack roll' then gets used for something else.
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1\$\begingroup\$ @royalmurder sort of... You still only hit once, which true strike probably would have let you do anyways. Assuming True Strike lets you hit on anything but a one, Perfect Strike improves your odds of hitting by 4.75%, or 4.9875% for the Zen Archer. \$\endgroup\$ Apr 28, 2017 at 10:51
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1\$\begingroup\$ I'm thinking more for the times when you do get a critical threat, then you're pretty much also guaranteeing a critical confirmation. And hey, that last 5% is what you want to avoid! (I have an aggravating tendency to roll 1s when using limited use per day abilities...) \$\endgroup\$ Apr 28, 2017 at 10:55
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3\$\begingroup\$ This is the case for all "reroll" or "roll X times" abilities, you use the same modifiers unless said otherwise. \$\endgroup\$ Apr 28, 2017 at 11:43
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1\$\begingroup\$ @ShadowKras I suspect the confusion arose from true strike saying specifically (since 2000!) that it affects [y]our next single attack roll (emphasis mine), which means the spell could be read as saying otherwise! \$\endgroup\$ Apr 28, 2017 at 17:55
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1\$\begingroup\$ @HeyICanChan yeah i thought the same, but checking the combat and magic chapters on the SRD, the "single" keyword is pretty much everywhere. It has no special meaning. The "single" is there so people wouldn't think that they gain a +20 on all interative attacks. \$\endgroup\$ Apr 28, 2017 at 18:03
Perfect strike states:
You can roll your attack roll twice and take the higher result.
As such it is still one attack roll that is rolled twice. By that you can roll twice, choose the higher and then add the +20 to the result.
Would it say that you make two attack rolls only the first could gain the bonus but as both die rolls are the same attack roll you can choose.