Bloodvelds shouldn't pose much of a threat to most players as they have low defence and don't hit very hard. However, they do have high lifepoints for their level and so it may take lower-levelled players a while to kill them, although if using throwing weapons, it shouldn't really be a problem.
It's worth noting that Bloodvelds are one of the best sources of Green charms.
An alternate to the low-level Bloodvelds in the Slayer Tower for high-level players on a Slayer task are Mutated bloodvelds which provide much more experience.
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