• Level: 10
• Casting Time: 1 action or bonus action
• Range: Sight
• Components: V, S (the caster's own blood, drawn as part of the casting)
• Duration: Instantaneous
• School: Necromancy
• Classes: Sorcerer, Wizard

Spell Description: Bloodseeker's Revelation is a formidable spell that harnesses the caster's life force to unleash a devastating attack while simultaneously granting profound insight into the target's essence. By sacrificing a part of their vitality, the caster delivers a dual-aspected blow of physical and elemental fury, intertwined with a deep magical connection that lays bare the target's strengths and vulnerabilities.

Mechanics:

1. Health Cost: The caster takes 50 HP damage as part of the spell's cost, which cannot be mitigated or reduced.
2. Damage Output: The target suffers 30d8 piercing (or slashing or bludgeoning, chosen at the time of casting) plus 30d8 fire damage. This versatile assault adapts to exploit the target's physical vulnerabilities.
3. Knowledge Gain: Upon hitting the target, the caster immediately learns detailed information about the target, including current HP, Armor Class (AC), movement speeds, senses, resistances, immunities, ability scores, and saving throw modifiers.
4. Non-Spell Nature: Despite its power, Bloodseeker's Revelation does not count as casting a spell for the purpose of rules limiting the number of spells cast in a turn, allowing it to be used alongside other magical effects.

Note: Bloodseeker's Revelation embodies the ultimate sacrifice for knowledge and power, making it a spell of last resort for those willing to risk their own demise to ensure their adversary's destruction. This spell not only inflicts severe damage but also provides a comprehensive understanding of the target, potentially turning the tide of any battle.