While a bit heavy and lacking in cutting damage, Dried Essence Shard is actually nothing to frown at. Having the lowest cost out of all summonable swords, it's also sporting very decent range and is quite sturdy. If you find yourself struggling with maintaining a sword and the River Gladius' shard cost and weight are too much for your build, this one is a decent enough choice instead. Also, this seems to be the most frequent out of all sword drops - very easy to acquire, as such.
Also notable as *the* training sword! If you want to train a friend - or a stranger - with some of your moves, I'd strongly recommend using this weapon. Given that your friend is likely to be wearing some cut-heavy gear for your training, you can pretty much minimize collateral damage using this - and the low cost and high durability means you'll likely be able to keep going for a while.