As Primary Rally Leader:Premier own-rally captain for Bear Trap (10% Infantry / 10% Lancer / 80% Marksman) and Sunfire Castle (50/20/30). Unlike standard heroes, Jeronimo provides a permanent passive global troop Attack & Defense buff just by owning him, and his Exclusive Widget grants up to +15% Rally Troop Lethality & Attack.
As Far-Left Rally Joiner:Always use Jeronimo to start your own rally so his Exclusive Widget (+15% Rally Lethality) and all 3 Expedition skills apply. If joining an ally's Bear Trap rally when your own rally is already out, his Lv. 5 1st Expedition skill (+25% damage) works in the far-left slot, though F2P Epic joiners (Jessie, Jasser, Seo-yoon) perform the exact same joiner job.
Recommended Gear & Charm Focus:Mythic Infantry Hero Gear (prioritize Gauntlets/Gloves & Belt for Infantry Health/Defense with Essence Stones & Mithril) + Exclusive Gear Widget Lv. 10 (+15% Rally Attack/Lethality) + Coat & Pants Chief Charms