Cube slime of chance

Passive ability:Armor is instead determined by a 1d20 when someone goes to attack this creature, plus the dex modifier as usual.

When the battle begins, the slime will determine the dex modifier it has with a 1d20 roll. If they roll 10 or below, it's negative. 11 or higher will be positive(a nat 1 will automatically make it a -4 to dex, while a nat 20 makes it an auto +4 to dex instead of rolling for it). Roll a 1d4 to determine what the modifier is.

Slimy smack Melee Weapon Attack: +0 to hit, reach 5 ft., 1 target. Hit:  (1d6) [Acid] damage.

Lucky spit. RangedWeapon Attack: +0 to hit, range 10/50 ft., 1 target. Hit: (1d8) [Acid] damage.

Action:Lady Luck

This action can be done once per time this creature has taken 5 or more damage in one hit. The next attack it chooses to hit or not get hit by will always end in a guaranteed hit or dodge. For the attack, it is only treated as a successful hit, not a critical hit whatsoever. This action takes up one normal action, or reaction depending on if it's attacking or being attacked.