If you do not want to kill Z'ant (or any of the T'Rang) you will have to reload a previously saved game (before you killed any of the T'Rang). There are certain areas of Marten's Bluff that the T'Rang don't want you to enter, and if they catch you doing so (and you ignore their warning) they will attack you. There is no way to make peace with them once you have done this.
If you're okay with killing the T'Rang, but can't handle Z'Ant right now, you can always go do some other things, get some levels, and return later. If you decide to kill them, there will be other quests (not given by the T'Rang) that will still be available to you.
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Erydian<br />
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