Diamond golem

Diamond golems are 10 feet tall and are often carved in the likenesses of knights or warriors.

Special abilities
A diamond golem has 50/+3 damage reduction; the usual construct immunities to critical hits, death magic, disease, level drain, ability drain, mind-affecting spells, paralysis, poison, and sneak attacks; and immunity to spells of level 9 or lower.

The weapon of a diamond golem dispels magical effects on-hit as a level 14 caster. In addition, this creature can cast sunbeam twice per day and true strike ten times per day, both as spell-like abilities with a caster level of 15.