when you kill someone who has an extra ability from gem of souls while using the gem of souls yourself, you do not gain their extra ability. The wording of the item makes me think this is a bug, but then again, this also looks like something that could have been done on purpose.
If sacred candle is going to protect against bleeds and poisons, then it should say (immune to negative effects) not (immune to debuffs) for debuffs usually mean stat-lowering effects.
Bug report: Single player, random card, Anex (Quickening feather, 3hp, Enchant blade x2) vs. Helene (Stone totem, full health, Enchant blade x2), Anex attacked with Power shot, listed damage was 87, did 79.
 "MARDEK RPG: Chapter 2"){kind=icon}
 "Kongai"){kind=icon}
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 "StarShine"){kind=icon}
 "Luminara"){kind=icon}