From back of book
The Heartbeat Of Hell Calls To You
Somewhere in the depths of the Abyss, the thrumming rhythm of a disembodied heart rises like burning thunder, and only you can hear it. The pounding beat consumes your every sense, and the sole release is through the sticks in your hands and onto the skin of your drum.
The Music the heartbeat breeds within you erupts in chaotic fonts of magic on licks of flame and crests of shockwaves. It leads you and comforts you and protects you and grants you power beyond your fondest imaginings. Now, take your drum and go forth to destroy all before you.
A complete 5E-compatible guide to running a multi-class Bard + Warlock sub-class from Levels 1-20
Includes original sub-class features, spells, magic items, monsters & NPC's