A rare, extreme long-range weapon for snipers. It's possible to do a lot of damage with one of these before an enemy even realises what is happening to them. Takes skill to use effectively, and not much use at short range.
Eagle's Cross is a Crossbow with very long range and high damage. It can be dangerous in the hands of an unskilled shooter; a single friendly fire incident on an unprotected core body part could be lethal.
Weight of ammunition is also another consideration. On long adventures a smaller crossbow may be more suitable, as you can carry far more regular bolts with 30 bolts per stack than Long Bolts which are limited to 10 bolts per stack with more weight, requiring regular resupply. Though as a defensive weapon the Eagle's Cross is unequaled.