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I know from the CRB p. 183 that Grenade DC is
DC = 10 + 1/2 Grenade item level + attacker Dex Mod (ignoring penalties).
But looking through Alien Archive example NPCs the Grenade DCs are all over the board, and don't seem to be related to that formula. I thought then they must be related to the Ability DCs listed in tables 1, 3, and 5. But they don't seem to be related to those, in any way I can determine.
For example take the Nuar Specialist on p.86 of AA. It has a frag grenade III DC of 18.
A frag grenade III is item level of 8. The Dex mod is +0 The CRB would have
DC = 10 + 1/2 8 + 0 = 14
Table 3 for Experts of CR 8 have Ability DC of 18.
Ok, I thought, just use the Ability DC for Grenades. But that doesn't seem to hold.
Aeon Guard (CR 3) p. 6 of AA
Grenade DC of 14, regardless of Grenade level. But Table 1 has Ability DC of 12. The NPC has a Dex mod of +4, so that can't be it.
How does one determine the Grenade DCs for NPCs?

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Looking at the chart, it appears to be the same way they determine other NPC Save DCs. By the chart (or within a point of that in one or two cases). Which makes perfect sense given how NPCs work (ie: their stats never effect Save DCs).
The only exception to this is the Aeon Soldier...which is clearly and objectively built wrong in at least one other way already (AC, to be specific).

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Looking at the chart, it appears to be the same way they determine other NPC Save DCs. By the chart (or within a point of that in one or two cases). Which makes perfect sense given how NPCs work (ie: their stats never effect Save DCs).
So the Item Level of the grenade does not enter into it. I can sort of see why.
Thanks