It requires much energy to maintain them, and summoning many of them in a short period of time is quite...taxing. I should venture to mention at this point that this form is also somewhat...vampiric by nature.

[Of course, with that revelation he took a few measured steps away out of courtesy.]

When drained of my own energy, I take by touch from others what I require to continue. However, fear not, I have no intention nor need to do any such thing here or now. Moreover, I am able to summon other creatures as well.

[He paused again, and added in a somewhat sheepish tone.]

It has been a while, though. If you will pardon me for a moment so I do not grow weary too quickly, I will continue after the drain of what was required for battle with the other subsides...