There you go
https://forums.elementalgame.com/422067
It's as of 0.86.
Nature's call (Tactical/ Earth and Life disciple)
Pariden's Return (Tactical/ None) - summons Titan for 5 turns
Summon Earth elemental (Strategic/ Earth Master)
Summon Fire elemental (Strategic/ Fire Master)
Summon Ice elemental (Strategic/ Water Mage)
Summon Shadow Warg (Strategic/ Summoner path)
The latest 0.90 adds 3 more summons I think.
+ Added the Call Slag spell- Summons a slag into battle
+ Added the Call Uteran spell- Summons a great cave bear into battle
+ Added the Demonic Ally spell- Summons a demon into battle