Intimidate

Intimidate causes monsters to attack you, rather like a "taunt" aggro skill in other MMORPGs. (However, unintelligent monsters are immune to the effect). Plus, barbarians can take an enhancement so that inimidated enemies are shaken, penalizing their actions. The intimidate code in DDO is still being tweaked, so it remains to be seen how useful it will be. Right now, a successful intimidate roll will mean the subject will not attack anyone else for at least 6 seconds.

To use intimidate well, you obviously want to be very well protected. Consider tower shields, Defensive Stance, and simply holding down Shift to block. The Combat Expertise feat is a fine way to boost your AC, if you meet the intelligence requirement. Alternatively, if the opponents are spellcasters, you might like the Resilence feat, which boosts your saving throws.