Salut,

Dans le heroclix core rulebook il est marqué page 20-21 :

Heroclix Core Rulebook a écrit:

RELICS
Certain immobile objects are listed as a “Relic.” A relic will be listed with a range of numbers. Relics can’t be destroyed.
If a character occupies the same square as a relic, that character may be given a power action to roll a d6 that can’t be rerolled. This roll is called a relic roll. If the result of that roll is within the indicated range of numbers (or higher), the relic is assigned to that character, placed on that character’s card, and the character will gain certain abilities, as described on the relic’s card.
When a character with a relic on their character card is defeated, place the relic in the square they last occupied.
At the end of the game, if an opponent’s character has a relic on their card or all of your characters have been defeated, victory points for the relic are scored by your opponent.

Il n'est pas marqué que le nombre de tentatives est limité.

Dans le heroclix player guide section 7, il est marqué page 2 :

heroclix player guide section 7 a écrit:

Relics are special objects that are Immobile and can’t be destroyed.
Once per game per character, give a character occupying a square containing a relic a power action and roll a d6 that can’t be rerolled.
On a result matching the relic value noted on the object, place this object on that character’s card.

Là la limitation à 1 fois par partie pour un perso et une relique est bien précisée.

J'aurais donc voulu savoir si un perso pouvait tenter plusieurs fois sur une partie un jet pour une même relique ?

Oui, c'était un jet/partie dans la première mouture et ça a été modifié par la suite donc ça se retente sauf indication contraire.