Sea monster

Sea monsters are the following monsters living in water:

• ; jellyfish
• ; piranha
• ; shark
• ; giant eel
• ; electric eel
• ; kraken

The eels and kraken can pull you into the water, which can drown you very quickly, unless you have magical breathing, or are wearing a noncursed greased cloak or an oilskin cloak, in which case they cannot grab you.

Some people use the NetHack options file to replace the ; character with another, more readable one (such as 7) as a way to better distinguish a dangerous class of monsters from the water symbol.

A fun way to deal with annoying sea monsters is teleporting them out of water and then fighting on land where their maximum HP is 1.