[Psitticine]

In my Last game as Rl'yeh, I combined Gift of Health (via an empowered and artifact-enhanced lizardman shaman) with Ritual of Return. That was the key to keeping the summons coming.

I had a pair of Starspawn Priests in the capital. One would summon until feebleminded, and then his partner would take over while Gift of Health healed the first one. The Ritual of Return protected them to some degree from those ambushes by void creatures.

It worked out really well, even given the cost of researching Gift of Health (which was actually a side-effect of going for something else) and boosting the nature mage up. Since the nature mage provided many other benefits as well, it was a good system. I think I might use a Pretender with nature magic next time, however, as that would remove the problems of finding and training/forging for an independent nature mage.