Heartbound Bond

Heartbound Bond is Sprout's Additional Ability.

Skill Scaling

	1	2	3	4	5
DMG Increase (%)	30	37.5	45	52.5	60

Notes:
- Not all Bangboo feature a Bangboo Chain Attack Skill.
- The Additional Ability is only levelled through Core Upgrades.

System Optimization (Promotion)	Requirements	Cost	Result
10/20		Ether Electrolyte 4 Denny 15,000	Active Skill Level +1 Bangboo Chain Attack Level +1
20/30	Inter-Knot Reputation: Certified Proxy	Energy Transfer Fluid 12 Denny 35,000	Active Skill Level +1 Bangboo Chain Attack Level +1
30/40	Inter-Knot Reputation: Senior Proxy	Energy Transfer Fluid 20 Denny 75,000	Active Skill Level +1 Bangboo Chain Attack Level +1
40/50	Inter-Knot Reputation: Elite Proxy	Concentrated Cooling Fluid 10 Denny 125,000	Active Skill Level +1 Bangboo Chain Attack Level +1
50/60	Inter-Knot Reputation: Legendary Proxy	Concentrated Cooling Fluid 20 Denny 250,000	Active Skill Level +1 Bangboo Chain Attack Level +1

Core Upgrade	Cost	Result
1 → 2	Sprout Core 1	Active Skill Level +1 Additional Ability Level +1 Bangboo Chain Attack Level +1
2 → 3	Sprout Core 1	Active Skill Level +1 Additional Ability Level +1 Bangboo Chain Attack Level +1
3 → 4	Sprout Core 1	Active Skill Level +1 Additional Ability Level +1 Bangboo Chain Attack Level +1
4 → 5	Sprout Core 1	Active Skill Level +1 Additional Ability Level +1 Bangboo Chain Attack Level +1

Total Cost: (1 → 5 for one skill)

4

Language	Official Name
English	Heartbound Bond
Chinese (Simplified)	同心之契
Chinese (Traditional)	同心之契
Japanese	同心の契り
Korean	같은 마음 Gateun Ma'eum
Spanish	Vínculo sincero
French	Lien sincère
Russian	Сердечные узы Serdechnyye uzy
Thai	Heartbound Bond
Vietnamese	Khế Ước Đồng Tâm
German	Herzgebundenes Band
Indonesian	Heartbound Bond
Portuguese	Vínculo de Almas Gêmeas

Released in Version 2.5 - To Be Fuel for the Night