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Bone-shaking Thunder is a level 4 evocation spell. It is a variant of Kereska's Favour that allows its caster to imbue themselves with the power of thunder and unlock resistances and spells associated with it. It is granted by Markoheshkir.
Description
Embrace Kereska's thunder to gain resistance to 
Thunder damage. Your thunder spells deal additional Thunder damage equal to your proficiency bonus.
When you deal spell damage, inflict 2 turns[See Notes] of 
upon the target. While attuned to Kereska's thunder you can cast 
and 
at 5th level once each per short rest.
Properties
- Cost
Action- Details
Range: Self
Recharge: Short rest
At higher levels
Casting this spell at a higher level grants no additional benefit.
Condition: Rumbling with Kereska's Thunder
Duration: Until Long rest
- Affected entity has resistance to Thunder damage.
- Its thunder spells deal additional damage equal to its proficiency bonus.
- When it deals spell damage, it inflicts 2 turns of upon the target.
- While attuned to Kereska's thunder, it can cast and at 5th level once per short rest.
How to learn
Notes
- The in-game tooltip says this effect inflicts 1 turn of Reverberation, but it actually inflicts 2 turns.
- Applying Reverberation can only occur once per attack. A spell hitting multiple targets like will only apply the condition to a single target.