User blog comment:Sifter66/What makes a late-game champion?/@comment-1920550-20150602002210/@comment-1920550-20150602143409

It's true that range is a key factor but a few ADC's can have solid lategame scaling without it. Lucian and Sivir, are 500 range ADC's that have a decent lategame compared to say Ezreal, Corki, Kalista, Graves.

Lucian has a unique combination of burst and sustained damage due to his passive. He also has incredible mobility due to his W-E. That makes him a potent duelist. His ultimate is perhaps the only AD damage spell that doesn't get outscaled by crit in the lategame due to it's synergy with attack speed. That makes him a powerful teamfighting champion.

Sivir has massive AOE burst due to her Q-W combo, aside from the W attack speed steroid/AA reset which gives her nice dueling power. Then you have the utility of her ultimate and passive which gives her incredible movespeed for chasing and kiting and her spellshield that can block key CC spells if timed correctly.