The Bruise Blamish Snail can be found in the depths of the Mort Myre Swamp. A chisel may be used on the shell it drops to make a snelm. There are two types of these snails:
Those with roundish shells, which drop roundish shells.
Those with conical or pointed shells, which drop pointed shells.
After the Evolution of Combat, they became much less accurate. Their attacks deal Ranged damage despite having a similar animation to Curse. Also, it can only be used in melee range and they have a weakness against Fire spells. They appear to have a max hit of 1 despite what is stated by Monster Examine.
A chisel (or the "Craft" option) can be used on either shell to make a Snelm of the same shape as the shell. The pointed version of the shell is more valuable, as few pointed-shell snails can be found and the snelms made from their shells are often in demand, being a requirement of a clue scroll.
The snails are aggressive towards lower levels.
Both types of bruise blamish snails spawn just north-east of Fairy ringBKR. Another pointed snail could be found just north of Nature Grotto. Another round snail could be found east of it, and a third just outside of the walls of Castle Drakan.