the low-life bonus you get from the black pearl gem is so strong it completely invalidates the “trade-off” of having lower HP. you can still stack HP to have decent HP and the damage bonus you get by multiplying all your stats x2 offsets it massively.
you also get “free” plagued gear, because you can use the “downside” to put yourself in permanently low hp. plagued gear should carry a downside, not turn it into an upside.
the mechanic means that the optimal play is using black pearl gems for any build - which is boring : )
multiplier gems in general are the status quo - they’re not necessary, but if you’re optimising, they are the best.
essentially having an obviously better option turns the choice into an illusion.
i suggest changing “low life status” from <50% of maximum total HP, into <50% of maximum available HP. that way the black pearl still activates when you’re actually low on hp and you start to hit like a train. but you don’t get to roll with constant 2x multiplied stats.
i welcome contrary opinions because to me this seems completely one-sided
p.s. this game is awesome