Grond
IMHO it would be great to bring this unit to game, it can be really fun to use, everything is ready just need optimal stats. My proposal: Cost ~2500-3000, build in Siege Works level 3, build time like Mumakil. Can attack only buildings, structural damage like Sauron, Mumakil trample and ~15% stronger armor, ~20% less armor vs pikes. Passive nullifier or leadership ability.
Source: http://www.gamereplays.org/community/index.php?showtopic=969566&st=0