Broken Heart is a Relic in Bloons TD 6. It causes all towers to deal +5 damage to Regrow Bloons. Anything that prevents regeneration (e.g. Grow Blocker) does not prevent the damage bonus from applying. It stacks additively if both the Map Relic and Store Relic are active, increasing the bonus to +10.
Broken Heart is a niche relic but generally useful in preventing regen farms to otherwise weak-to-regen strategies. While most strategies can handle by themselves, it can be useful in almost any tile type in the right situation, including Special Poperations Heli saveups on Least Tiers, as a cash-saving measure in Least Cash, or preventing pierce caps in Time Attack tiles.
Compared to Heartless, Broken Heart is usually better against Regrows; most regen farms are caused by weak projectiles, and Heartless's only advantage is working with DoTs. Having both is not necessary, as they already do enough to prevent a regen farm.
Update history
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We’ve included slight tweaks for a few relic knowledge. Many of these relics are having slight number increases as they seem to have low value across all tile types (relics with low usage only on some tile types have not received changes as they still have value in niche cases) [...] — Update notes
Damage bonus increased ― +1 → +2
Description changed to be more accurate