Phy Defence Increase - At level Silkroad gold 100, your phy passive and buff will increase your phy defence by 336 which is a considerable amount. To put it in prospective, a 98 +5 Chinese Shield has 230 Phy Defence. This phy defence increase gives you an edge over any other Str Fire/Light build in PvP, which is the main reason why it's so successful in PvP.
Cold Imbue–we have got to be honest, Ice Imbue was a bit of a disappointment for us. 95% of all capped players Silkroad online gold are Ice Immune, rendering Cold imbue pretty useless. It is not without its strengths though; it is useful for jobbing when you get those.
Hunters/Thieves that have just been ressed with Oblation, and are unbuffed without Fire Shield or Holy Spell, then the Ice Imbue comes into its own. We also used it as our main Imbue for SRO PvE. For the amount of SP it costs however, we did not think it was worth it. So we deleveled this skill, but do not let us put you off just because we do not find it useful, maybe you will.