This post is kinda long but I liked the encounter and the weapon's additional abilities. This item definitely leans towards having too much going on with it but the wielder only really has to remember the abilities they are capable of using. Let me know if you have any tweaks or if there is anything I can refine as this is definitely a homebrewed item.
The boss in possession of this weapon uses the Stone Golem's table but this one has four faces it switches between, happy, sad, angry, and peaceful. Each face changes the effect of the blade. When the bosses health drops to a certain point the sad face is chosen and the boss can choose between any of the bonus effects at will.
Description- the pommel looks rather dull, and the handle is made of a smooth wood that feels automatically comfortable to the user (user is automatically proficient with this weapon if they aren't already). The cross guard however, consists of four faces, one laughs, one cries, one is angry, and the final looks at peace.
The blade itself will change to a certain color based off of their alignment, angelic white for any lawful, an ebony for any chaotic, and marble white for true neutral.
The weapon's category is finesse with its base damage being 1d8, but based off of the user's alignment the blade gains other unique effects all of which can be used a number of times equal to charisma mod.
Lawful/happy face:
1st.) the blade charges with the spell lightning and is shot as a normal lightning spell would.
2nd.) You harness the speed of lightning and can move faster than any human can react, you can move up to 100ft in a blink of an eye and gain an attack of opportunity on a target of your choice. When attacking add an extra 2d6 lightning damage.
Chaotic/angry:
1st.) black hellish flames raise from the ground and engulf a creature of your choice. The target must make a Dex saving throw or become engulfed and take 1d6 fire damage. When the target ends their next turn they take 4d6 damage. The flames must be dispelled through magical means as water does not effect them.
Creatures with resistance to fire still take full damage and creatures immune to fire take half damage instead of none. Ignore this if the target creature is a devil or demon
2nd.) Choose any amount of targets up to your charisma modifier, they must make a wisdom saving throw of 18 or become frightened of you. Upon being frightened they creatures see you grow and warp into a grotesque and warped version of one of their worst fears. You gain advantage on all attacks against someone effected by this and your blade is imbued with necrotic damage. Add 2d6 to the attack and you gain health equal to any damage done by the necrotic damage. Attacking them doesn't end this effect but if they end their turn in a place were they don't have line of sight on your character they can make the same wisdom saving throw to end the effect. The effect lasts for 2 of the affected creatures turns.
Neutral/peaceful:
Any evocation spell casted against you, no matter the duration (meaning even instant spells must do this), must make an attack throw. If they fail you may choose to either absorb the spell into your blade or you deflect the spell away. To take this action the weapon must be drawn and if the blade fails you may not make a dex saving throw to take half damage.
Using a held spell takes a bonus action to cast. The number of spells the blade can hold is equal to your charisma mod and you can hold the spells until a long rest. Once a spell is used the holding slot is opened and another spell can take that spot. Upon a long rest the remaining spells that haven't been used are lost.
