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http://elitistjerks.com/f47/t37804-w...endium/#Impale
http://elitistjerks.com/cgi-bin/math...t{BonusDamage}
Impale also has repercussions on the effect of a [Relentless Earthsiege Diamond] or [Chaotic Skyflare Diamond]. When a special (yellow) critical strike occurs, the
3% bonus of the meta gem is applied first, taking into account the
200% critical strike damage. This results in the strike causing
206% damage. The damage of a non-critical strike is then subtracted from this in order to determine the crit bonus damage portion of the strike which is
106%. This portion of the damage is then multiplied by the
20% bonus from Impale, resulting in
127.2% crit bonus damage, summing to
227.2% normal damage on the impaled special critical strike.