First of all, you will need Lineage2FileEdit tool. :)
Open the file Weaponsgrp.dat file located inside you Lineage2/system directory.
After you opened WEaponsgrp.dat you will see alot of lines.
ALL you need to do is modify some values.
The Concept is simple. You have rows and columns, each having values.
You will see at the top a value called is_hero, and under it the value -1 for normal weapons.
All you need to do is change the value -1 to 1, and add the effect of the hero weapon, by modifying the effect line in the row.
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The row is this:
0 151 1 1 7 10 0 LineageWeapons.sword_of_miracle_m00_wp LineageWeaponsTex.sword_of_miracle_t00_wp icon.weapon_sword_of_miracle_i00 -1 840 47 1 0 7 1 1 LineageWeapons.sword_of_miracle_m00_wp 1 LineageWeaponsTex.sword_of_miracle_t00_wp 4 ItemSound.sword_big_3 ItemSound.sword_mid_9 ItemSound.sword_great_4 ItemSound.public_sword_shing_8 ItemSound.itemdrop_sword ItemSound.itemequip_sword 10 186 152 1 4 8 0 0 0 0 379 0 1 1 1000 0 [glow=red,2,300]-1 0 LineageEffect.c_u006[/glow] 4.0000000 0.0000000 0.0000000 0.8000000 0.8000000 LineageWeapons.rangesample 1.3500000 0.7000000 0.7000000 11.0000000 0.0000000 0.0000000 6 -1 -1 -1 icon.weapon_sword_of_miracle_i01
u need edit this "[glow=red,2,300]-1 0 LineageEffect.c_u006[/glow]" to "1 0 LineageEffect.e_u092"
HERE ARE THE HERO WEAPON VALLUES:
LineageEffect.e_u092_a single sword
LineageEffect.e_u092_b two-hand sword
LineageEffect.e_u092_c axe
LineageEffect.e_u092_d mace
LineageEffect.e_u092_e hammer
LineageEffect.e_u092_f staff
LineageEffect.e_u092_g dagger
LineageEffect.e_u092_h fist
LineageEffect.e_u092_i bow
LineageEffect.e_u092_j dualsword