Any changes in crossbreeding?

[NTJedi]

Oversway said:

Doesn't this spell already do that?

Not really... one of the best is the ettin... and even he is nothing powerful without other spells being casted.

Oversway said:
What it needs is either a much higher chance to get better creatures (around half of them sounds good), or to make some improvements to the fodder ones. Or both.

More variety is always nice, of course.

Improving existing fodder or increasing the chance will cause the spell to be near equal of the other blood spells. Thus gamers would eventually discover which blood summon is the best deal and usually choose it.
If this spell had several new and much more powerful rare creatures in the mix then it would introduce a new type of summoning spell... a gamble summoning spell.