Animus Mine

You implant a mental mine within your psyche that detonates against anyone attempting to manipulate your thoughts. For the duration, when a creature targets you with a magical mental effect such as a detect thoughts spell, the animus mine violently explodes. The creature must make a Wisdom saving throw, or have one of the following effects occur:

• if the creature rolls a 20 on the die and succeeds on the saving throw, or uses its Legendary Resistance to succeed, it is unaffected by the animus mine
• if the creature succeeds on the saving throw, it takes 4d8 psychic damage, reduced to half
• if the creature fails the saving throw, it takes 4d8 psychic damage and is stunned until the end of your next turn
• if the creature rolls a 1 on the die and fails the saving throw, it takes 8d8 psychic damage and is stunned until the end of your next turn, and you are unaffected by the triggering mental effect.

This spell does not prevent mental effects from affecting you. You can use your action to suppress the spell for 1 round to allow a creature to safely use a mental effect on you. Additionally, you can use your action to dismiss the spell.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each spell slot above 2nd.