Talisman or talisman means an amulet, charm, or some other object that supposedly has occult power or influence --
He wears it as a talisman; he believes that it wards off evil.
She is preparing a talisman, complete with a sacred insciption hidden inside.
Talesman or talesman means a juror, someone called from among the spectators or bystanders to fill out a jury with too few people --
He was summoned as a talesman, and won't be home until the trial is over.
The hearing was postponed because there were only ten jurors, and one was a talesman.
Now that you know that, you can say --
"He served as a talesman at the trial, and claims that his talisman helped him to vote wisely."
