From publisher blurb:
Shields Up! expands on defensive shield use and also details the often-neglected roles of shields as offensive weapons and active tools of engagement.
Building off of the Dungeon Fantasy RPG and Fantastic Dungeon Grappling, Shields Up! enhances and expands your shield-using experience.
Leverage the "shield bind" to open lines of attack, or protect yourself
New explicit options for treating the shield as cover in combat. Hide from a rain of arrows, or crouch behind your shield to shelter from dragon's breath!
Use a shield actively to hold a foe at bay, or prevent them from coming into weapons range
Details on shield damage, overpenetration, and all the goodies you'd expect when the right answer to "shield wall!" is "Thog SMASH!"
Also includes rules for shields as gear, modifying them for particular use, how to treat shields relative to creatures of different size, and more.