[Ragnarok-X]

Can someone explain how combat actually works ?

I think i know this:

Attack skill and defense skill are weighted against other to calculate odds about hitting the target.
If you hit, the strength is added to the weapons damage and then the targets protection value is substracted to get the exact damage.

Where exactly does a weapons length come on on this?
How does a shield come in ? Is it included in the attack vs defense skill ? How does it aid missile defense (tower shield) ?

How does fatigue/encumbrance work ?
Trample ?

- thanks