warstrider!

Warstrider: This gigantic steel vehicle looks like a Colossal
centipede. Its multiple segments and legs make it quite flexible.
The vehicle can move at a speed of 40 feet and travel up anything
but a completely vertical surface. Small arrow slits in
the middle segments allow defenders inside to fire arrows or
crossbows at foes outside (a total of nine archers have room
to fire). If the warstrider is moving, the driver must use a fullround
action each round to control it. Otherwise, the driver
can control the “head’s” iron-mandibled mouth, which can
make a +15 bite attack that inflicts 3d6+10 points of damage
and has the improved grab ability (grapple +27). Alternatively,
the driver can use built-in jolt ray emitters† (page 25) that fire
from the warstrider’s “antennae.” These have a +10 ranged
attack bonus. He can use both antennae in the same round
(as a full attack action).
The warstrider measures 100 feet long and 10 feet wide. It
has an Armor Class of 12 (–8 for size, +10 armor bonus), a
hardness of 10, and 1,000 hit points. It has room inside to
carry 24 Medium creatures, including the driver and nine
archers. It has a single reinforced steel door. Checks for
chaotic failure are required no more than once per week.
Special activation; Craft DC 45; Price 200,000 gp;Weight
200,000 lbs.