Tiny Pulp
Tiny Pulp has 50 health.
It takes extra damage from blunt, frost and lightning; it resists slash, pierce and fire; poison does nothing to it at all.
Of everything craftable, 
Lightning Strike, 
Frostfire Sledge and 
Thunderblood Sledge put the most damage through what it resists.
Tiny Pulp is what a 
Shapeless Pulp leaves behind when it dies, 1 to 2 at a time, in Mörkhalla in the Deep North. It has 50 health and the usual blob defences: weak to blunt, frost and lightning, resistant to slash, pierce and fire, immune to poison. Its walk speed of 10 is the highest of any blob and more than double its own run speed of 4, so it keeps pace without ever needing to charge. The only drop is 
Dead Pulp at 25%.
Same weaknesses as the parent, blunt and frost and lightning, on a third of the health. Clear them immediately rather than letting a room fill up, because each one is still a body between you and the door.
With devcommands enabled, this spawns Tiny Pulp in front of you. The third number is the level: 3 spawns a 2-star.
Creature ID: BlobMorkMini · all console commands and IDs