Now for the moments that sword & shield Chosen really shine in.
Try to be the team leader out there. Granted there's no wow gold military Barrett on your head, but know that you are the front line. Melee dps need you to keep their attention to get in there and do their job. Caster classes need you to play linebacker and make sure they stay safe.
Healers know your guard ability can make them nigh unkillable on the field. And everybody loves a free buff or two f Aion your auras. They need you up front, which tends to make your routes and attacks lead the rest into joining.
Understanding this, call out incoming, keep people f Aion overextending if you see it starting to thin out too much on your front line. Guide them to fall back if the situation calls for it. After all, a successful push against the enemy is inevitably going to lead you to their safe haven of guards and that is always a losing battle.
Call out to fall back and lead them away f Aion their safety into their doom; having said that, the above does not translate into dictate everyone's job to them in all caps. I see too many tanks trying to tell everyone else how to do their job as part of a group or raid, and more often than not it is them who are lacking in their ability to perform their own duty as a tank.
On that note, the highway to no heals is to detail a healer's job to a healer. Don't do it unless it's very apparent that they are not watching you on the brink of death -if- they should be.)