data merge entity @s {drop_chances:{mainhand:0.5f}}
data modify entity @s equipment.mainhand set value {id:"minecraft:diamond_axe",components:{custom_data:{specialtool:tag,2hand:tag},attribute_modifiers:[{type:"max_health",amount:-0.4,slot:mainhand,operation:add_multiplied_base,id:"-1236128770822556-175416"},{type:"attack_damage",amount:11,slot:mainhand,id:"-1236128780822556-175616",operation:add_value},{type:"attack_speed",amount:-3,slot:mainhand,id:"-1236128790822556-175816",operation:add_value},{type:"armor",amount:0.5,slot:mainhand,operation:add_multiplied_base,id:"-1236128800822556-176016",operation:add_value},{type:"attack_knockback",amount:2,slot:mainhand,id:"-1236128810822556-176216",operation:add_value}],item_name:{"text":"Heavy Battle Axe","italic":false},lore:[{"text":"Two-handed","italic":false,"color":"red"}]}}