You Master the Art of fighting with a weapon that serves multiple uses and fighting styles.
When you use such a weapon, you can Switch the weapon type once per round as a free action. You also can use this weapon as a spellcasting focus.
If you get a critical hit with such a weapon, you can choose one of the following Things to happen, depending on what suits your weapon best (DC: 8+ Prof + your used modifier for the weapon).
Brutal strike: Your weapon slashes a big wound to your target. It has to make a constitution saving throw or take 1d10 points of damage at the start of its turn, until the wound is healed, wich can be done as an action or with a healing effect that heals at least 10 hit points.
Precise strike: You pierce a vital nerve in the creatures sistem. It hast to make a constitution saving throw, or get disadvantage on all attack rolls, get disadvantage on all perceprion checks that rely on sight or lose 10 feet of movement speed (your choice) until their next short or long rest.
Crushing force: You brutaly bludgeon the armor/mobility of the target. It has to make a constitution or dexterity saving throw (its choice) or lose armor class equal to one roll of your current weapons damage dice, until the next short or long rest.
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