Sword clashed against dragon's scales.

Meaning: The warrior's weapon made a loud sound as it hit the hard, protective covering of the creature.

Choice of Words: Sword is a weapon with a long, sharp blade. Clashed means to make a loud, ringing sound by hitting something hard. Against indicates opposition or conflict between two things. Dragon's is the possessive form of dragon, indicating something belonging to the dragon. Scales are the hard, protective plates covering a dragon's body.