Hereupon
/ˌhɪrəˈpɑːn/
Definition 1 of 1
Pro Tip 1/3Immediate Sequence
Hereupon implies something happens right after another event without delay. 
The judge gave her verdict and hereupon the court was adjourned.
Pro Tip 2/3Formal Contexts
Often used in formal, legal, or historical writings rather than everyday conversation. 
Hereupon the agreement was signed, initiating the partnership.
Pro Tip 3/3Narrative Effect
Used to create a dramatic or official effect in storytelling or reporting. 
The villain was defeated; hereupon, the hero returned home victorious.