Knowledge (Tactics) (Int)
Your understanding of martial arts, the art and science of war, war machines, sieges, weaponry, and so forth. This can be used for...

Appraise Item Values: Just like Appraise for appraising item values but only for Armor, Weapons, and Shields.

Identify BAB: This functions like any other knowledge check for Monster Lore, except that you only learn what the creature's BAB is and can use it against ANY creature. Additional information you can learn if you beat the DC by 5 or more is limited to the following: Physical Ability Scores highest to lowest (ex. Dex, Str, Con or Con, Str, Dex), Combat Feats used during the encounter or that are always active, Extraordinary Abilities (only combat-oriented ones as determined by the GM), Natural Armor Bonus (whether its high or low 50% or more of its AC bonus or less than that), IF you witness it being struck by something its weak against you can also learn its Special Weaknesses to certain Weapons, Armors, or Shields (such as DR/silver or DR/adamantine). (Arena specific: Because the arena has an "all or none" with these checks, you would learn all these things on a successful save but would not know what the creature actually is or any of its magical abilities.)

Identify Combat Feat: Just like Spellcraft for Spells, you can use this skill to identify combat feats used by others. (Arena specific: I suspect some of you really want this.)

Identify Item Properties: Just like Spellcraft for identifying properties of magical items but this only works on Armor, Weapons, and Shields.

Class Skill: All classes with a full BAB get this as a class skill and a few others. This includes Barbarian, Brawler, Bloodrager, Cavalier, Fighter, Gunslinger, Inquisitor, Monk, Paladin, Ranger, Samurai, Slayer, Swashbuckler, Warpriest.

Any class that grants you the War domain grants this as a class skill as well.

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A) Yes, add to Arena.

B) No, don't add to Arena.
This message was last edited by the GM at 13:00, Wed 04 Apr 2018.

So, let's say I had an archer and was using Precise Shot, Point Blank Shot, Rapid Shot, Clustered Shots, Two-Weapon Fighting, Many Shot and Weapon Focus, which would all apply to 1 full attack, most of which are passive.

Would 1 knowledge roll apply every feat modifying the attacks? Would it be 1 roll per attack? Would it only reveal the actively visible feats such as manyshot, rapid shot and clustered shots?

I think it's a great idea, but maybe some clarification, as spellcraft is one spell at a time, but a single attack could have many feats effectint it at once.

A

Pretty cool! A

I'm down.
A

Why not. A.

You should identify who gets it as a class skill. I imagine Fighter, Paladin, Ranger, Monk...

Note that anyone with a half hour to kill on pfsrd can identify any monster just with the visible information in their stat block.
The combination of HP/ACs/CMD forms a signature that is as good as a fingerprint.

That has some usefulness against gladiators though.