And another noob who complains because he doesn't understand how the game works and doesn't care to actually learn..
Unyielding Will (the ability in question) drastically improves the combat power of the Eradica once you kill it. Basically, you get its health to zero, it throws a tantrum for a few minutes, and then dies. The solution to that ability is literally to just leave. It is actually one of the least useful titan ultimates in the game for a number of reasons.
Please try to actually learn what's going on before coming to rant on the forums. If you can't address something, obviously it must be overpowered and it isn't at all possible that you don't yet know what you're doing.
"So far I am not impressed with rebellion. Fighting Advent titan with my fleet and titan and fully upgraded starbase. Wiped out their fleet, and got their titan down to 145 hit points. Then suddenly the gosh darn thing goes blue, and Im not able to kill it. It stays blue, then I cant hit the gosh darn thing and it heals. All the while its killing my starbase and titan. This thing is invincible, cheap, overpowered, cheating, you name it."
Bad.
"Hey guys, I'm new here and umm.. What's with the Advent titan making itself invincible? I can't figure out how to kill it. Any advice?"
Good.