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The Injection Reservoir Adjustment allows you to inject a poison into the target on a successful attack.

...Immediately after a successful attack with the adjusted weapon, you can inject the target with the loaded poison...

Many athletics maneuvers are attacks. If I apply the Injection Reservoir to a piercing weapon with the Trip, Grapple, Shove, or Disarm traits, such as a Thorn Whip, can I activate the Injection Reservoir upon succeeding with one of these maneuvers?

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2 Answers 2

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You can activate it, but it doesn't do anything

Per the series of events described above, you can activate the Injection Reservoir and release the poison as you described.

However, this will likely not achieve the overall goal of causing the target to be affected by an Injury Poison, because you will not have satisfied the requirements for Injury Poisons which states (emphasis mine):

An injury poison is activated by applying it to a weapon or ammunition, and it affects the target of the first Strike made using the poisoned item. If that Strike is a success and deals piercing or slashing damage, the target must attempt a saving throw against the poison. On a failed Strike, the target is unaffected, but the poison remains on the weapon and you can try again. On a critical failure, or if the Strike fails to deal slashing or piercing damage for some other reason, the poison is spent but the target is unaffected.

As indicated above, you can only affect a target with an Injury Poison if you land a Strike that deals either piercing or slashing damage to the target.

The primary purpose of the injection reservoir is to mitigate the other requirements for applying injury poisons to a weapons. Namely, you don't have to use it on the first target that you Strike, nor are you subject to the critical failure consequences.

So ultimately, you'll trip them and then squirt them with an injury poison, but you won't have successfully administered said poison.

As a side note, this answer is based upon the Remaster requirements for injury poisons, but these requirements appear to be unchanged from the Legacy requirements.

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    \$\begingroup\$ That rule is for delivering the poison by coating a weapon. You aren't coating the weapon in this instance, although you could do both at once by coating the injection reservoir weapon. In either case, those are two separate requirements. \$\endgroup\$
    – Strill
    Apr 16 at 16:23
  • \$\begingroup\$ Yeah, I would argue the Injection Reservoir adjustment is more specific here and overrides the normal injury poison rule which requires a successful strike. \$\endgroup\$
    – ESCE
    Apr 16 at 17:23
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Yes

The Injection Reservoir requires that the weapon be one which deals piercing damage, and that the reservoir be activated after a successful Attack. If the description were restricting the item to Strikes only, it would require a "hit", which is short for "Successful strike". Its description does not use any language specific to the Strike action, such as "hit" or "attack roll", nor does it require you to deal damage.

Bottom line: Trip, Grapple, Shove, and Disarm are all attacks, and could potentially allow you to activate the Injection Reservoir, provided your weapon has the corresponding weapon trait, and you've met the Injection Reservoir's other requirements.


(side-note, this assessment also applies to the Weapon Siphon as well)


EDIT: The requirements for Injury Poison that you successfully strike and deal damage with a piercing or slashing weapon do not apply, because that is describing how to deliver the poison by coating the weapon. Coating a weapon in poison is a separate, independent delivery vector. You can see it tells you whether the coated poison is lost on a failed strike, which isn't relevant to the injection reservoir. To further illustrate how separate these two are, you can coat a weapon in poison, AND attach an Injection reservoir at the same time, to potentially deliver two doses of poison in a single hit, in the right circumstance.

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  • \$\begingroup\$ As I read this, it appears you are suggesting that a successful Trip is sufficient to cause the target to be affected by the Injury Poison within the Injection Reservoir. But I'm unclear on why you think the Injury Poison requirements aren't still applicable. \$\endgroup\$ Apr 16 at 14:02
  • \$\begingroup\$ It's possible this is fully correct way to view the rules for Weapon Siphon, but that should probably be a separate question. \$\endgroup\$ Apr 16 at 14:08
  • \$\begingroup\$ Because Injury Poison's requirements are for delivering the poison by coating the weapon in poison, which is separate from the injection reservoir delivery method. \$\endgroup\$
    – Strill
    Apr 16 at 16:25
  • \$\begingroup\$ @Strill: There's nuance here. In terms of delivery vehicle, a piercing attack with a coated weapon or one with a hollowed out piercing weapon (i.e. syringe) will deliver it in much of the same manner. If volume of delivery counts, you can argue that an injection can deliver more poison, but we generally handwave physical volume in favor of assuming that poisons are exactly as potent as their delivery mechanism requires them to be. Given that injury poisons are defined as piercing/slashing, I'd say that the distinction here is between is attack (injection reservoir) vs strike (injury poison). \$\endgroup\$
    – Flater
    Apr 17 at 4:27

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