1. You go to Skillgrp.dat, look for Skill id and find Effect Id
1553 1 1 0 194 900 16 3.00000000 1 G 1553 icon.skill1553 0 0 0 a,none\0 0 8 10 0 a,none\0
2. You use L2PE(https://sites.google.com/site/l2clientmod/l2pe) to open LineageSkillEffect, look for 1553 and find Emmiters
Casting Action: l2_1553_skill.L2EffectEmitter0
Channeling Action: [l2_1553_skill.L2EffectEmitter3, null, null, null, null, null, null, null, null, null, null, null, null, l2_1553_skill.L2EffectEmitter13]
Shot Action: [l2_1553_skill.L2EffectEmitter1, l2_1553_skill.L2EffectEmitter4, l2_1553_skill.L2EffectEmitter2, null, null, null, l2_1553_skill.L2EffectEmitter6, l2_1553_skill.L2EffectEmitter5]
3. In the same file, you look for the l2_1553_skill.L2EffectEmitter0(it's good to sort everything by name, not ID) and find Effect Class
Effect Class: LineageEffect.wh_sec_heal_ca
4. You use L2PE to open lineageeffect.u, look for wh_sec_heal_ca and find Sprite Emmiters
Emmiters: [d_chainheal_ta.SpriteEmitter5, d_chainheal_ta.SpriteEmitter6]
5. In the same file, you look for the d_chainheal_ta.SpriteEmitter5, and find Texture
Texture: LineageEffectsTextures.Particles5.fx_m_t8137
If you want to change the value, you can decrypt lineageeffect.u(using L2PE doesn't require decryption), look for fx_m_t8137 with notepad++ and change the value. To change numbers, booleans, you will need to have hex editor or create your own editor