How much Damage would a Lightsaber do in D and D?

[Swordguy]

The "10% of total hit points damage" bit is also pretty dubious- basically- it will mean that it only takes, at most, ten good hits to kill anything, even gigantic monsters.

Out of curiosity, how many hits does it take a power attacking, pouncing, frenzied berserker to take out pretty much any canon monster in the monster manual?

'Cause I'll bet it's less than 10...