Ascalon

''A primal strength flows through you, the beast stands no chance against you. You have mastered the art of slaying dragons, and forged a weapon that has no equal in this task, but never have you killed an ancient wyrm before. Until now that is. You swing down and cleave with all your strength and the creature's head slides free. You affix the chains to the head and begin the arduous climb back down, truly a master of your trade. Color be damned, must have been a real bastard if somebody wanted you to kill it, and the rumors weren't true, silvers will definitely fight back.''

Greatsword, requires attunement
+3 weapon, mastercrafted, tetsudium. Scores critical hits on a 18-20, and 16-20 against dragons. Immune to fear/charm. Ignore exhaustion while in combat. You may reroll 1s and 2s on your weapon damage dice keeping the new total if you do. Deals triple critical damage.