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Blood particle spreads on damage (redstone block particles). It required a minimum of 2 damage to spawn, and the effect intensify with higher damages.
Execution fx occured when killing nearby mobs. It depends on the blood type on the target.
Blood traces spawn on damage, bleedings and kill. Corpses stay longer on the ground.
Blood particles spawns on player low health. Bleedings intensity depends on your current life.
When falling from high enough, a custom fx spread. Bleedings might spread.
Blood particles spread differently in water (red dust color transition). You also get bubble on your head when suffocating.
Adjust options in the ingame menu

Add blood, bleedings, blood traces and executions on kills. (purely cosmetic)