The formula for acid bomb in renewal is currently unknown (see discussion page) but we know that the renewal acid bomb formula not changed of all since that acid bomb change of INT to ATK/MATK. However, the % reductions in PvP and normal maps changed (reducing damage in boss monsters and increase damage in players. (for this, the % damage was modify in the information description of the skill) very similar to 75% damage (but somes users says that the damage in players now don′t have decrease to 50% in pvp and the damage increase in 50% and the 25% reduction can be for the regular PVP reductions in skills).