Blade's Skald's War Chant

You imbue yourself with the legendary heroism and might of the lost Giants of Ostoria. Until the spell ends, you can’t cast spells using spell slots, and you emit a constant loud music that can be earded 330 ft away, as a spectral chorus chant haunting and epic war songs in the language of Giants. You gain the following benefits:

• You gain 30 temporary hit points. If any of these remain when the spell ends, they are lost.
• You have advantage on attack rolls that you make with simple and martial weapons.
• When you hit a target with a weapon attack, that target takes an extra 1d10 force damage OR thunder damage (you decide wich type applies when you cast the spell). If the target is a dragon, it takes an extra 1d10 damage of the same type.
• You have proficiency in Strength and Constitution saving throws.
• You are immune to the frightened condition.
• You and any friendly creatures within 20 feet of you have advantage on saving throws against being frightened or charmed

Immediately after the spell ends, you must succeed on a DC 15 Constitution saving throw or suffer one level of exhaustion.