Lizard, Gigantic Monitor
No. Enc.: 1(1)
Movement: 90′ (30′)
Armor Class: 3 
Hit Dice: 18
Attacks: 2 (bite or trample, tail)
Hoard Class: None
These gargantuan monitor lizards can grow to 100′ or greater in length. They are generally survivors from an earlier age which have been trapped below the earth’s surface for eons. When freed, either accidentally or intentionally, the beasts generally rampage wildly, devastating anything in their path. Their tough scaly hide makes them highly resistant to attack, which is reflected in their good armor class and saving throw values.
The bite of a gigantic lizard is poisonous, reducing victims’ strength and dexterity scores to 3 for 1d6 hours unless a successful save is made. A ‘to-hit’ roll of natural 20 indicates that the victim has been swallowed whole. Creatures as large as horses may be swallowed whole.
A gigantic lizard may elect to trample any creatures in its path (25′ wide) rather than biting, doing 2d12 to all targets hit. This attack is also effective against buildings and walls.
The huge tail of gigantic lizards makes up half of its overall length and swishes about violently, possibly striking anything or anyone in the rear flanks of the creature. This is not an intentional attack by the monster and ‘to-hit’ rolls are at -2. However, up to four targets within striking distance may be attacked in this manner per round. The tail also leaves a wide swath of destruction as the lizard passes.
Despite the size of the gigantic lizard, it is essentially an animal. Though powerful and destructive, it acts with no malice and hunger is its primary motivation. Huge fires (a burning village or forest, for instance) may drive it off, though there is a 50% chance that it may only incite the beast to berserk rampaging at +2 to hit.
White Box Stats:
I hope to keep Monster Monday a regular feature here on the blog despite taking the past few weeks off. As of this installment, I will be posting monster stats in Labyrinth Lord format and including a S&W White Box format stat block at the end of the write-up. These are the two games I’m playing these days, and it seems to me that between these two stat blocks every old-school game should be covered with little or no undue conversion work.
One thing I’m struggling with is the conversion of powerful monsters to the White Box format. With few exceptions, damage in WB is 1d6 and attacks are limited to one per round. This fits in fine with the lower power curve of WB (a redeeming feature of the original game, in Kilgore’s humble opinion) but makes conversions of powerful monsters a bit tricky.
For instance, do I simply remove the tail attack from the gigantic monitor lizard because monsters have only one attack? In this case I did not, though I don’t think that leaving it in is exactly kosher. I also switched the damage to d6-based but left the bite at 2d6 instead of downing it to 1d6. Even dragons do only 1d6 of bite damage per round, which is something I’m having a little trouble getting my mind around.