Innate Spellcasting. The seeker's innate spellcasting ability is Intelligence (spell save DC 15). It can innately cast the following spells, requiring no spell slots:
Other Mind. The seeker can communicate telepathically with any creature it can see within 30 feet of it. Focused. The seeker has advantage on Constitution saving throws to maintain concentration on a spell when it takes damage. Mage Armour. The seeker has Mage Armour casted on itself at all times.
Knowledge Drain. Melee Spell Attack: +7 to hit, reach 5ft., Hit: 7 (2d6) Psychic damage.