>>47662413
kill them.

they'll learn.

Warn them, let them die.
If this still doesn't work, then it's time to realize that the group you play with is a pack or murder-hobos and you'll have to adjust your DMing style to accommodate this or find a new group.

>>47662413
Provide an objective implication that they should be careful.

Kill them while rolling openly, then tell them "I gave you like twelve warnings IC and OOC that you'd probably get TPK'd if you tried to fight the black dragon at level 5 with half health and missing spell slots.

Let it wipe the floor with them, then offer them a chance to escape.

Have them fight an endless list of monsters that set traps in their lairs

I have the opposite problem. My players wipe the floor with my encounters even when in-story they are extremely challenging (they literally wiped a dozen wyverns after pissing off an entire flock. I had a combat inspired by the Magnus Lacey WFRP story that gets posted here sometimes, and the PC's killed it instantly then proceeded go massacre the rest of the pack.

Fuck Savage Worlds.

>>47662413
My players assume every encounter I throw at them is level appropriate. Half the party died during an escalating encounter and they had to spend a month doing a side quest to revive them. They learned.

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>>47662413
It's warhammer. Kill them.

Do it.

>>47662413

But it's in character for me to run in and charge in head first, even if it WILL kill me.

If I lose my character because of it, it's no one's fault really. That's just how it goes.

>>47662413
The thing they attack fucks them up completely.

>>47662413
>>47662913
>>47662867
>>47662979
you already have all the information you need, op. pull punches if you want, but if you pussy out and let them slide every time, they'll do it every time.