Tome of Prowess (3.5e Sourcebook)/Arcana

Arcana

The Arcana skill represents dedicated study into the workings of arcane magic. While that study manifests itself most strongly as the ability to better understand and recognize arcane magics, those who study Arcana also learn the underpinnings of creatures created and maintained with those magics, constructs and the undead. Characters with substantial training in Arcana can even use arcane spell trigger items containing spells not normally accessible within their class and ignore attribute requirements on magical items.

Key Attribute: Intelligence

Minimum Rank 2 Uses

Creature Insight

While learning more about how arcane magic functions, you've also learned more about what makes some of the most common arcane creations and allies, constructs and the undead, "tick". Constructs are solid, lifeless creations animated by magic bound to their frames. The undead are the remains of once living creatures, animated to serve even in death or to grant a form of immortality. You know enough about the basic working of these creatures to recognize what abilities any individual member might have, even those you’ve never seen before.

Attempting to identify or glean information about a creature is an immediate action. The DC for this check is 16 + the creature’s CR. The creature does not have to be alive for you to try to gather information about it, though deceased creatures need to be identifiable and largely intact.

Special: The arcana skill only allows you to identify undead and constructs, and there are five other skills that provide similar knowledge for other creature types. If your DM is a nice guy, he’ll just tell you which skill you need to roll to gather information about a creature. As this may reveal more information than they want, they may not tell you which skill you need. In that case, only roll once for all skills; just add your modifier from each skill to your roll and give him all five results separately.

DC: 16 + target’s CR
Check	Result
DC+10 and above	You correctly guess everything in the lower success results, as well as every other special quality and attack that the creature has. In a less serious game, you can just ask the GM for their notes and read up on it while everyone else gets into position.
DC+5 to DC+9	In addition to the information learned from a basic success, you also correctly guess 3 special attacks or qualities of the creature. These are either determined randomly from those you have not yet witnessed or you may ask for further details on one you have witnessed (type of DR if you have witnessed it, type of breath weapon, etc.).
DC+0 to DC+4	You correctly guess the creature’s type, subtypes, and any traits that would come as a result of those categories. If the creature is sufficiently common, you also know its name, and that may provide other information.
DC-1 and below	You are unable to reach any conclusion that you have confidence in. You can not retry this check until you witness one of its special abilities or qualities first hand; sometimes getting bathed in acid jogs a memory.

Ability Progression

None. Your maximum ranks scale with the CR of your opposition, providing similar levels of information on foes regardless of level.

Identify Magic

When you run across magic, it’s nice to know if it’s magic that will help you or flay you alive. The Arcana skill primarily deals with the esoteric magic of wizards, though it can be used to identify spells or effects from any sourceThe various uses of this skill include identifying a spell as it is being cast, identifying a standing magical effect, identifying magical residue after an effect ends, etc. You must have detect magic or equivalent spell active or possess an etheliometer to learn anything with this ability.

The action required depends on which of these two methods you use, and is described in those methods. You gain information about the magical phenomena based on your check result.

Special: The arcane skill is specialized for arcane magic, and may not be the best skill for you to use to learn about a particular effect. If your GM does not specify which skill you need to roll, and they are well within the rules not to, only roll once for all skills; just add your modifier from each skill to your roll and give him all 3 results separately. Your GM is responsible for making sure that you get the largest applicable bonus and applying it to your check to learn about an effect.

DC: 16 + twice the effect’s level or 16 + caster level for non-level effects, +2 for each degradation period passed since an effect ended
Check	Result
DC+5 and above	You recognize the type of magic (arcane, divine, primal) and learn its school, subschool (if any), caster level, and spell level (if applicable). If the spell is arcane, you also learn the name of any spell or effect that you could generate yourself, that you have compelling reason to know about (stories, commonality, etc.), or that has a spell level less than half your character level (rounded down). If the magic is divine or primal, you only learn the name if you have a compelling reason to know about it.
DC+0 to DC+4	You recognize the type of magic (arcane, divine, primal). If the magic is arcane, you also learn its school, subschool (if any), caster level, and spell level (if applicable). You also learn the name of any spell or effect that you could generate yourself, that you have compelling reason to know about (stories, commonality, etc.), or that has a spell level less than half your character level (rounded down).
DC-1 to DC-5	You recognize the type of magic (arcane, divine, primal), but nothing further. Additional checks may yield more information.
DC-6 and below	You do not recognize this effect and understand nothing about it. Additional checks may yield more information.

Ability Progression

None. Your maximum ranks scale with the CL of magic effects you are likely to discover, providing similar levels of information on effects regardless of level.

Minimum Rank 4 Uses

Arcane Item Affinity

A little knowledge about obscure arcane magical theory goes a long way. With it you can attempt to use arcane spell trigger items even if you lack the ability to normally use the spells within them. But your skill with the arcane doesn’t stop there. Arcane magic is based on tricking the world into doing what you wanted it to do all along, and some of those tricks work to coax magic items into working for you even when you lack the prerequisite attributes. If a magic item requires a certain ability score to function, you can try to ignore that requirement as well.

For continuous use items with an attribute prerequisite, this check requires a swift action. Otherwise, the action to use this ability is included in the activation action for the item. The DC for this check is equal to the minimum required ability score or 14 + the item's caster level, whichever is higher. If you succeed on the check, the item functions as if you have the minimum required ability score for a period of time based on your check result. You may not attempt this check again during any period while it functions normally. You must wait for the item to stop responding to you before you may make an additional check.

Note that this ability only activates items that are arcane in nature or that have an attribute prerequisite to their use. It only covers those portions of the activation. Items that have an attribute prerequisite but are not arcane, or that have additional non-attribute prerequisites, may not be covered by this ability. In this case, additional checks with other skills may be required.

Special: If your use of this ability triggers a cursed item, the cursed item becomes activated and functions normally for you until the curse is broken by a spell, class feature, or similar ability. This indefinite duration replaces the normal check based duration.

DC: minimum required ability score or 14 + caster level, whichever is higher
Check	Result
DC+10 and above	The item functions normally for you for 1 hour, during which time you can use charges or receive benefits as appropriate without making further checks.
DC+5 to DC+9	The item functions normally for you for 1 minute, during which time you can use charges or receive benefits as appropriate without making further checks.
DC+0 to DC+4	The item functions normally for you for 1 round, during which time you can use charges or receive the benefits of it as appropriate.
DC-1 to DC-5	The item does not function for you at this time. You may make another check after spending another activation action on the item.
DC-6 and below	The item loses 1 charge or use (if applicable) and becomes inoperable for 2d4 minutes. You recognize the temporary shutdown.

Ability Progression

None. Your maximum ranks scale with the CL of magic items you are likely to posses, providing similar levels of item use regardless of level.

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