Pavise The heavy shield carried by the Skaven at the front is very effective against missile weapons, but too bulky to be of any use in close combat. It confers a 5+ armour save against ranged attacks only (normal and magical missiles). This combines with the team's basic save for a total armour save of 4+ against missiles.
Reliable Jezzails are the most reliable weapons .. developed by Clan Skrye (they're almost safe!). For each Jezzail that obtains a result of 1 on its roll to hit, roll another dice. If this second dice rolls a 2-6 the shot was a dud and all is fine, but if the result is a 1, the gun has a serious problem. To represent this, the Jezzail hits itself (roll to wound as normal).
Cavalry Base Weapon teams consist of two Skaven models mounted on a single cavalry base. Treat them exactly like cavalry models, except where otherwise specified. This means that they have a Unit Strength of 2 and get a 6+ basic armour save (to represent that there are effectively two models to kill, similar to cavalry models). This also explains their two Attacks.
