Arrow

This type of upgrade increase the power of each arrow the bows fires by a fixed damage. it is divided into 3 evolutions, requiring speial materials to pass from one to the other * Capped at 50000

Additionally, there are 3 types of upgrades, Fatal Blow, Power Shot and Split Arrow

Fatal Blow
The first upgrade is fatal blow, which gives a % for the arrow to deal more damage when it hits an enemy. This is the "critical hit". This upgrade is available from stage 1 and has the following cost. The critical base damage is 200% but, alongside the crit chance, it can be increased at the Dragon's Treasure.

Each arrow has it own critical chance so, when firing multiple arrows, it can happen that one crits but not another.

Power Shot
The second upgrade is power shot. Increases the force of the arrow, knocking enemies back. This upgrade is available from stage 1 and has the following cost.

Split Arrow
Increases the damage of the bow by a %. Each evolution also increases the number of arrows that the bow shoots by 1, up to a maximum of 4. * Capped at 50000

Soul of Arrow
Lastly, there is the Soul of Arrow which increases the overall damage done and grants 1 extra arrow. This upgrade is automatically obtained when Sylph, Gnome, Undine, and Salamander are obtained (Either paying money or via the monthly calendar).