You completely open the floodgates of your life force, siphoning away your own physical vitality to forcefully overclock the spiritual or physical matrix of a creature bound to you.
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Strict Catalyst Restriction: This spell can ONLY target a creature that is your personal summon, pet, or companion. It cannot target normal party members or standard allies. This restriction is absolute and completely overrides any racial features or traits that allow you to target multiple creatures with a single spell. You can only maintain one instance of this spell at a time.
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The Overclock Buff (The Persona Apex): For the duration, your summon/companion breaks past its physical limitations, gaining the following massive enhancements:
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Unstoppable Might: Its attack rolls gain a +4 bonus, and all of its attacks deal an extra 2d6 poison damage & 2d6 nectrotic damge
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Apex Speed: Its movement speed is doubled, it gains an additional action on each of its turns (which can be used for the Attack, Dash, Disengage, or Hide actions), and its attacks ignore resistances.
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Immovable Anchor: It gains 50 temporary hit points, has advantage on all saving throws, and cannot be forcefully moved or knocked prone.
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The Caster’s Tax (The Harsh Backlash): To fuel this god-like state, your body falls into a state of immediate, violent decay. For the duration of the spell, you suffer the following crippling penalties:
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Brittle Bone Syndrome: Your Armor Class is reduced by 5, and you automatically fail all Strength and Dexterity saving throws.
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Vulnerability: You lose any resistances you possess and gain vulnerability to all physical damage types.
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Lethargic Siphon: Your movement speed is reduced by 20ft , and you cannot take bonus actions or reactions.
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If your concentration breaks or the spell ends naturally, your summon immediately loses all benefits, and you are Stunned until the end of your next turn from absolute exhaustion.
At Higher Levels (The Escalating Toll)
When you cast this spell using a spell slot of 6th level or higher, the energy injected into your companion becomes vastly more potent, but the physical burnout causes the debuffs to scar your body.
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The Stronger Buff: For every slot level above 5th, your companion's extra damage increases by an additional 1d6 necrotic / poison damage, and their critical hit range expands by 1 (e.g., scoring a critical hit on a 19-20 at 6th level, 18-20 at 7th level, etc.).
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The Extended Debuff: When the spell ends (whether naturally or through broken concentration), you do not simply recover. The physical penalties of The Caster's Tax (Reduced AC, Vulnerability, 5ft movement, and no bonus actions/reactions) linger on your character after the spell concludes for a duration equal to 1 round per level of the spell slot used above 5th.
Example: Casting this at 7th level grants your summon +5d6 extra damage and crits on an 18-20. However, when the spell ends, you remain completely crippled and vulnerable for 2 full rounds before your body recovers.
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