I was going to make a post detailing optimization for warlock reaper. Instead I'll post some stuff here:
This is for r3-r5.
1) Chain (up till lvl 6/7) then swap to cone. Keep cone all the way to 20.
2) GOO or Fiend or gtfo. Only go fiend if you have someone else in static group going GOO. Create thrall, knock, pk, dom person, and mass suggestion. Also major versatility to will based acid pact damage.
3) Prioritize dcs:
- Web and Stunning blast (conjuration / evocation) are the best for low levels. (prior to 6/7)
- Evards, suggestion, stunning blast, fear, pk (spell focus mastery is a must) prior to level 12.
- Evards + Necro (spell focus mastery, prioritize necro) till 20. Create thrall / hurl at 15 make a big difference.
4) Never put ANY points in ES. All points should pretty much be spent like this:
- Always have stanch
- Always have cone shape once you can.
- Prioritize pact die in TS
- T5 souleater at level 12. Spell point efficiency, finger sla, and eldritch wave.
- Wand/scroll amplification and feigned health are absolutely worth 3/3 points each.
5) Cannith craft gear at level 1, 5, 10, 15 - placing in rock boots if you feel like grinding challenges. Otherwise just make caster sticks they are good enough. (Worth the investment if you are doing more than 2 lives - it takes roughly 4ish hours to make all the gear if you farm correctly)
6) Some nice things to pick up
- Spellpoint trinket 20 major pot clicky - 3 medium eberron dragonshard fragments. (Always have 1 on you)
- Ioun stone spell absorption and archmage / spell pen
- gh pots
- flesh to stone runestones different tiers - cannith crafting
- dw clickies or dw pots
- yugo pots
7) Fear is often overlooked. It is beyond broken.