Improved Block - Improves your chance of blocking.
Only applies to classes which have the Block skill.Improved Parry - Improves your chance of parrying.
Only applies to classes which have the parry skill.With them merged, I still wouldn't expect them to work (nothing to improve) unless we had one or the other to begin with.
See
http://samanna.net/eq.general/effects.shtml - I guess that needs an update as well...