Whortleberry

Whortleberry is a magical herb of treachery and betrayal. Four drams in wine make the Philtre of Treachery: the drinker will betray the first person named in his or her hearing, whether by abandoning a friend in trouble or turning him in to the authorities, as the Game Judge decides. Unusually, this philtre has no time limit; the betrayal comes at the first chance. It grows in fields and woods and costs 3 S.P. per dram.