Abilities

Passive abilities

• Lifesteal — heal on hit
• Knockback — increased knockback strength
• Fire Aspect — fire damage over time
• Thorns — damage attackers
• Slow / Poison / Wither / Levitation — status effects on hit

Active abilities

• Dash — right-click teleport forward
• Chain Lightning — jumps to nearby entities on hit
• Explosive — AoE explosion on hit
• Freeze — applies slowness on hit

Hooks

public class Stormcaller extends ArmariaMeleeWeapon {
    public Stormcaller(Properties props) {
        super(props);
        addPassiveAbility(Abilities.LIFESTEAL, 0.15f);
        addAbility(Abilities.CHAIN_LIGHTNING, 4, 5.0f, 0.8f);
        setTexture(Texture2D.of("armaria:item/stormcaller"));
    }

    @Override
    public void postHurtEnemy(ItemStack stack, LivingEntity target, LivingEntity attacker) {
        VFXPresets.stormChain(attacker, InteractionHand.MAIN_HAND);
    }
}

Cooldowns and mana

Use the existing charge system as a mana proxy, and track cooldowns in ticks inside your weapon class.