Perception DC to locate abjuration spell

[Joseph Stracener]

Abjuration has the line, "If one abjuration spell is active within 10 feet of another for 24 hours or more, the magical fields interfere with each other and create barely visible energy fluctuations. The DC to find such spells with the Perception skill drops by 4."

What is the base dc to notice the abjuration spells?

[avr]

25 + spell level is the usual.

[wraithstrike]

I don't see a base DC for this anywhere in the book.

AVR do you have a reference for that DC?

[Hendelbolaf]

That is a direct holdover from 3.5 rules that substituted Perception for Search. I think it is referencing that to find a magical trap in 3.5 it was a search check with the DC set at 25 + spell level used to set the trap. It is the same in Pathfinder and that rule is now found under Magical Traps in the Environment section as opposed to the skill sections.

This 4 less DC rule would be applicable if the spells were of the abjuration school, like Alarm or something like that. This is just my supposition and not necessarily 100% fact.

Good luck!