SRD
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I don't know how you'll all support me in this, but honestly, there's one thing I always want to change – I don't like that some creatures, after their upgrade or improvement (whatever you want to call it), lose some of their abilities. I envision all of this as branches – that is, if we have, for example, a unicorn with an aura, then with both upgrade options, it should retain that aura, and only differ in the skills it gains (for example, the second level for humans – it could shoot with an arc; I upgraded it, and now it can't do that anymore – is it Homer Simpson, who forgets something old when he learns something new?:D)
Added 17 minutes later
That's exactly why I tried to remove the acid breath from the green creature, so that its attack would again be in the form of branches (it attacks one target, after the upgrade it attacks several, but in different ways – acid and lightning) because you can't say that prismatic breath is an evolution of acid – in one case it's a substance, in the other it's energy, and you can even say it's not related to the element of air, but to the element of earth – its concentrated energy (everyone remembers Earth Shock – there are no stones – only earth energy)
Added 17 minutes later
That's exactly why I tried to remove the acid breath from the green creature, so that its attack would again be in the form of branches (it attacks one target, after the upgrade it attacks several, but in different ways – acid and lightning) because you can't say that prismatic breath is an evolution of acid – in one case it's a substance, in the other it's energy, and you can even say it's not related to the element of air, but to the element of earth – its concentrated energy (everyone remembers Earth Shock – there are no stones – only earth energy)