With carp you'd probably want to add [PHYS_ATT_RANGE:STRENGTH:5000:5000:5000:5000:5000:5000:5000], [PHYS_ATT_RANGE:AGILITY:5000:5000:5000:5000:5000:5000:5000], AND [PHYS_ATT_RANGE:TOUGHNESS:5000:5000:5000:5000:5000:5000:5000]. Then add [ATTACK_PENETRATION_PERC:1500] and an [ATTACK_VELOCITY_MODIFIER:1000] to their bite attack. They were so powerful back in the day because they gained swimming skill, and attributes worked very differently so any skill gain would increase one of the only three attribute. Then attacks had some system where they did damage in numbers rather than calculations from material properties and velocity and all that stuff. Carp only had the default bite attack which was about three times as powerful as the standard punch which is what dwarves used most of the time. So adding this should buff their attributes and bite attack back to the point they used to be at. For elephants I don't really know. Elephants were powerful because size used to give big, direct bonuses to damage and damage resistance which can't be replicated very well. I suppose a [PHYS_ATT_RANGE:STRENGTH:5000:5000:5000:5000:5000:5000:5000] and [PHYS_ATT_RANGE:TOUGHNESS:5000:5000:5000:5000:5000:5000:5000] would kind of go towards that goal, but it's probably not enough. Another horrible monster that unfortunately got nerfed was the giant sponge. They used to be completely unkillable, but when pulping was added it became possible to kill them. I've heard that adding [PREVENTS_PARENT_COLLAPSE] to their body would work, but I'm doubtful. Anyway a good tool to do so was added recently, which would be to just add [SET_BP_GROUP:BY_TYPE:BODY][BP_ADD_TYPE:PREVENTS_PARENT_COLLAPSE].