Suggestion

When this spell is cast by the magic-user, he or she influences the actions of the chosen recipient by utterance of a few words—phrases, or a sentence or two—suggesting a course of action desirable to the spell caster. 

The creature to be influenced must, of course, be able to understand the magic-user's suggestion, i.e., it must be spoken in a language which the spell recipient understands. The suggestion must be worded in such a manner as to make the action sound reasonable; a request asking the creature to stab itself, throw itself onto a spear, immolate itself, or do some other obviously harmful act will automatically negate the effect of the spell. However, a suggestion that a pool of acid was actually pure water, and a quick dip would be refreshing, is another matter; or the urging that a cessation of attack upon the magic-user's party would benefit a red dragon, for the group could loot a rich treasure elsewhere through co-operative action, is likewise a reasonable use of the spell's power. 

The course of action of a suggestion can continue in effect for a considerable duration, such as in the case of the red dragon mentioned above. 

If the recipient creature makes its saving throw, the spell has no effect. 

Note that a very reasonable suggestion will cause the saving throw to be made at a penalty (such as -1, -2, etc.) at the discretion of your Dungeon Master. Undead are not subject to suggestion. 

The material components of this spell are a snake's tongue and either a bit of honeycomb or a drop of sweet oil.

Except as noted above, this spell is the same as the third level magic-user spell, suggestion (q.v.).