Arcamite

Hiding in abandoned places of magical energies, or laid as a trap for travellers, the arcamite is a parasitic bane to those who dabvle in magic.

Changes To The Host

 * Three times per short rest, the host can use a bonus action to cast a cantrip that would normally require an action. Each time this is done, the host loses hp equal to its spellcaster level.
 * The host gains one additional spell slot per level of spell it can cast. Each time this extra spell slot is used, the host must succeed on a DC 10 Constitution saving throw or gain one level of exhaustion.
 * Each time the host casts a spell, roll a d20. On a 1, the spell doesn't successfully cast but the spell slot is used. The arcamite absorbs the power of this spell.