Black Ice Ram

A ram consists of a movable gallery equipped with a heavy log suspended from two roof beams by chains.

The log is shod in iron and used to batter through doors and barricades.

It takes a minimum of four Medium creatures to operate a ram. Because of the gallery roof, these operators have total cover against attacks from above.

Sourced from Icewind Dale, black ice is a substance formed from the dust of Crenshinibon, the crystal shard, a source of supreme evil. When Crenshinibon was destroyed, the remnants of the crystal were flung far and wide, tainting the nearby ice, causing it to become metallic and corrupting. Black ice is mined by the dwarves of Icewind Dale, who are oblivious, or choose it ignore, its maddening properties.

A weapon made of black ice deals an extra 1d6 damage on a hit. Any character in possession of an item forged of black ice must make a DC 12 Wisdom saving throw each dawn. On a failed save, the character develops an indefinite madness (see "Madness" in chapter 8 of the Dungeon Master's Guide).