The bot lane in League of Legends is a crucial role that often determines the outcome of a game. Marksmen, with their high damage output and long-range attacks, play a vital role in securing kills and pushing towers. Here are the top 5 marksmen that have been dominating the bot lane in recent seasons:

1. Lucian: The Purifier's combination of mobility, burst damage, and sustain makes him a versatile and powerful choice. His ability to quickly engage and disengage from fights makes him a threat to enemy carries.

2. Jhin: The Virtuoso's unique abilities and high damage output make him a formidable force in the bot lane. His ultimate, "Curtain Call," can deal massive damage to multiple enemies, turning the tide of a teamfight.

3. Vayne: The Night Hunter's ability to evade enemy attacks and deal true damage makes her a strong late-game carry. Her ultimate, "Final Hour," allows her to deal increased damage and gain movement speed, making her a force to be reckoned with.

4. Aphelios: The Weapon Master's unique weapon system and high damage output make him a challenging but rewarding champion to play. His ability to adapt to different situations makes him a versatile choice for the bot lane.

5. Kaisa: The Void Seeker's ability to evolve her abilities based on her kills and assists makes her a strong scaling carry. Her ultimate, "Killer Instincts," allows her to deal increased damage and gain movement speed, making her a deadly threat in the late game.

While these marksmen have been consistently strong, the meta is constantly evolving, and new champions or strategies may emerge. It's always a good idea to experiment with different champions and find the one that suits your playstyle best.