Bone-shaking Thunder

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  Reverberation upon the target. While attuned to Kereska's thunder you can cast  Shatter and  Destructive Wave once each per short rest.

 Shatter ()

Cast as a level 5 spell ( Recharge: Short rest.)

 Destructive Wave ()

Cast as a level 5 spell ( Recharge: 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

 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  Reverberation upon the target.
• While attuned to Kereska's thunder, it can cast  Shatter and  Destructive Wave at 5th level once per short rest.

How to learn

Granted by items:

•  Markoheshkir

This spell is a variation of:
 Kereska's Favour

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  Shatter will only apply the condition to a single target.
• The proficiency bonus of thunder damage applied to spells is added to  Booming Blade when used with Markoheshkir in either the main hand or the offhand.

Bugs

• The version of Destructive Wave granted by this condition still displays the individual variant spells ( Destructive Wave: Necrotic/ Destructive Wave: Radiant) as costing a  Level 5 Spell Slot. Though no actual spell slot cost is incurred by the caster, these variants will still activate effects which trigger when spending spell slots.