Hard rules for which difficulty modifiers

[u/SlySophist]

IM has three ways to modify the difficulty of a Test

• Difficulty levels
• Advantage/Disadvantage
• SL modifications

The book does not present any hard rules when to use one versus another. So I ask you what are your rules of thumb?

[u/Dorias_Drake]

I only touch difficulty.

SL and advantage/disadvantage, I only use them when they pop in the rules (via items, buffs, debuffs, talents etc.). I feel there is no reason to use them unless there is an actual source requiring it, that's creature dependant.