
Cavall |
A spell that even if you could roll a save, there is no reason normally to do so as they in no way normally penalize you.
For instance a spell that made you better at profession rolls. If it included a save it would also likely say harmless eg : save Will (harmless).
The save is still there for people that may want to make a save anyways or have to by the rules because they must save against all spells no matter the source.

Adjoint |

I would also note that there are some effects that distinguish between harmless and not harmless spells, for example spell scourge.

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Darc1396 wrote:As title says, I googled and couldn't find a clear answer.(harmless)
The spell is usually beneficial, not harmful, but a targeted creature can attempt a saving throw if it desires.
Check the saving throws explanation section of the Magic chapter.
In case you didn't understand Gilfalas - he literally quoted the Core Rulebook definition of (harmless) in the Saving Throw section on page 216. He wasn't telling you what he thinks, he's telling you what the rule says.

Agodeshalf |

I will also note that if the spell says Spell Resistance: Yes, then even though it is harmless you must bypass the target's spell resistance if any. This can be quite a pain for those cure spells. The target can lower his/her spell resistance but that is a standard action, and leaves you vulnerable for at least a round.

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Darc1396 wrote:As title says, I googled and couldn't find a clear answer.(harmless)
The spell is usually beneficial, not harmful, but a targeted creature can attempt a saving throw if it desires.
Check the saving throws explanation section of the Magic chapter.
I like that you can choose to save even against a harmless spell, if, for instance, you are from a culture that shuns that sort of magic (arcane spells from an arcane-magic-hating / fearing people, a buff spell cast by an evil cleric, if you are a worshipper of their god's nemesis and want to avoid their 'blessing', etc.) for role-playing reasons.
There could even be mechanical benefits in very particular cases, like some demiplane were magic has a physical sense of weight, and it's possible to be encumbered, or even suffocated!, by the weight of one's own buffs.