From LSWiki

Class: Combat Skills

Attribute: Strength
Pedagogy: Physical Training

The ability to use shields in combat.  Influences both your ability to use 
a shield in its main function, deflecting attacks, and in using it offensively.

Trainers

Avalon: Bercilak
Kolond: Duthien (only trains dwarves)
Losthaven: Raelan Jax
Skarlan: Badlokk
Mycenae: Ijara
Mycenae: Kyros
Shakari: Tavar
Shatterspire: Sthlar
Stillwater: Captain Roberts
Association required:
Losthaven Guard: Captain Jonathan Tredwel
Maidens of the Spear:  Sulin
Guild required:
Elflords: Celeborn
Hawkmen: Katar
Knights of the Round Table: Sir Lancelot
Quest required
Corna Quests: Marshall Osaka

Shield types(in order of coverage)

• Buckler - Smallest
• Target
• Square
• Kite
• Tower
• Mantlet - Largest

Notes

• Tower shields may require 2 hands to use.

• Mantlets are basically mobile walls.

• Shields do crushing damage to a medium area when attacking.

• Shields come in a razor variety that has a razor sharp edge, allowing it to do cutting damage.

• Shields come in a spiked variety that has sharp protrusions on its surface which will do piercing damage.

• Massive Blow and Precision Strike add small amounts to the deflection rating of a shield.

• Shields can completely deflect or block some unarmed and ranged attacks.

• Shields do not fire off with the activity indicated, i.e. a 15 activity sword with speed of 40 will give 2 attacks, while a shield may only give 1 or none. This is intentional and meant to reflect the defensive nature of shields. Therefore it is unwise to rely on shields for damage output or to make them into guild weapons (like Traveler).

• Shields will not completely block melee weapon attacks, but instead either deflect the damage, absorb some of the impact of the direct hit, or reduce the effectiveness of the hit, largely depending on the weapon used against the shield. Some weapons are designed to reduce the effectiveness of shields, while others just have enough mass that even though the shield blocked the slashing aspect of it, the raw concussion traveled through the shield and into the wielder. If a shield absorbs some of the impact of a direct hit, it will become damaged in the process and lose some of its protective abilities.