Titan, I've thought of an additional ability for Terra but I don't know if it's too late to add it. I decided to create it because the only abilities that distinguish Terra are strength and speed. Here it is:
Justification: Similar to an internal lie detector, except that it is 100% effective. Terra simply asks the subject a question and if the person lies, his muscles tense considerably. They also tense depending on the level of the lie. For example, his muscles don't tense up as much over a half-lie then they do a full out one.