Originally Posted by
Zretch
Tentacles goes against a strength save, and Waves of Exhaustion (5th level spell) lowers strength as well as providing a moderate slow even if Tentacles is on cooldown. It's also a cone, so you can throw it out with the Eldritch Wave and cone blasts. I always take Finger of Death primarily because it wrecks beholders, which is a handy QoL thing when you run the VoN chain, RitD, etc.
Another thing to consider for a 4th level spell is Flesh to Stone rather than Teleport. Teleport is a spell that is very easy and convenient to cast from a scroll. Flesh to Stone sticks on low-fort mobs pretty consistently, holds for a long time before they get to make their second save attempt, and your blasts/bursts aren't effected at all (that I can tell) by the DR.