"It is in truth," he answered. "And I cannot be slain within a house nor without. I cannot be slain on horseback nor on foot."
"Verily," said she, "in what manner, then, canst thou be slain?"
"I will tell thee," said he. "By making a bath for me by the side of a river, and by putting a roof over the caldron, and thatching it well and tightly, and bringing a buck, and putting it beside the caldron. Then if I place one foot on the buck's back, and the other on the edge of the caldron, whosoever strikes me thus will cause my death."
"Well," said she, "I thank Heaven that it will be easy to avoid this."
No sooner had she held this discourse than she sent to Gronw Pebyr. Gronw toiled at making the spear, and that day twelvemonth it was ready. And that very day he caused her to be informed thereof.
"Lord," said Blodeuwedd unto Llew, "I have been thinking how it is possible that what thou didst tell me formerly can be true. Wilt thou show me in what manner thou couldst stand at once upon the edge of a caldron and upon a buck, if I prepare the bath for thee?"
"I will show thee," said he.
Then she sent unto Gronw, and bade him be in ambush on the hill which is now called Bryn Kyvergyr, on the bank of the River Cynvael. She caused also to be collected all the goats that were in the Cantrev, and had them brought to the other side of the river, opposite Bryn Kyvergyr.
And the next day she spoke thus: "Lord," said she, "I have caused the roof and the bath to be prepared, and lo! they are ready."
"Well," said Llew, "we will go gladly to look at them."