There are four dwarf scrolls in "Stardew Valley". Each scroll has a unique location. To find the third dwarf scroll, you need to kill specific monsters to have a probability of obtaining it. Each monster is in There is a 0.5% chance of dropping items when killed, such as slimes and magma bats.
Where to find Dwarf Scroll 3 in Stardew Valley
The third dwarf scroll has a blue scroll and, unlike the first two, cannot be obtained by plowing. If you want to get this scroll, each of the following monsters has a 0.5% chance of dropping it when killed:
Any Slime
Magma Bat
Magma Crab
Squidward
Shadow Beast
Shadow Shaman
Metal head
Spider
Blue Squid