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By Anonymous
Quite good on ranged characters.
Against high AC enemies, even if you miss, you reduce their AC by 2, making it easier for your melee strikers to kill that enemy
By Anonymous
The added acid damage is good (the page is incorrect it's 2d4 damage not 1d4 as of writing).
However, the acid surface created are actually majorly hindered by the fact that blood washes off the acid. So if your arrow hit, the blood from the enemy seems to wash away the acid at their feet, so unless they move into the rest of the acid, the acid surface doesn't reduce their AC.