The traveler is supposed to be the protagonist in the story and yet becomes almost invisible in most of the game content. Some suggestions to make him/her on back to the team again:
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Skill revamp and unique talents - incorporate his/her abilities such as stealing, charming the enemy into his/her skill or talent. For example he can steal weapon/armor/runes from the enemy during the battle to weaken the enemy, as well as extra loot after the battle, or charm the enemy to turn on the others or drop out of battle temperately.
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Basic attributes enhance stats - higher strength give bonus to attack stat, higher intelligence gives more bonus when applying effect, higher dex gives bonus to attack speed or skill speed, etc.
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Race modifier - human being average, drawf have bonus while crafting items, elves has higher base endurance, etc. Also special bonus when construct teams with same race, such as all elven team, all human team, all lizards team, etc.