Hi there!

Like everyone else, i messed with different "Summoner" bugs, trying to run it on a modern machine with discrete videocard and Win 7 | Win 10. What i found - there is no way to make "Summoner" running with D3D normally even with wrapper - game even doesn't detect that kind of renderer, and if you try to start it without setup - error appears (or black screen).
Then i found that using DGVoodoo there is a way to make game run perfectly with 3dfx Glide renderer. It solved all known bugs as overspeeding after cutscenes, unhidable Windows panel, broken camera, craches to desktop, and more. The only found problems with this renderer is strange working textures (some problems with lights, textures with shadows may flicker sometimes) and forced 16-bit color (because of Glide). You don't need to be worried about 16-bit color since "Summoner" was designed to work with this palette, and textures with broken brightness will be seen no more (just check any brickwall in Lenele Docks to understand).

So, what do you need to do to make "Summoner" run on modern systems?

1. Go to http://dege.freeweb.hu/ (malware free) and download latest stable version (today it's 2.62.3 - 20.11.2019);

2. Unpack it's contents somewhere;

3. Copy/paste "dgVoodooCpl.exe" to "Summoner" root folder (where sum.exe is);

4. Copy/paste .dll's (Glide, Glide2x, Glide3x) from "x86" folder in "3Dfx" to "Summoner" root folder (where sum.exe is);

5. Run "dgVoodooCpl.exe", go to "Glide" tab and configure as follows:

3dfx Card: Voodoo 2
Onboard RAM: 12 MB
Resolution: Unforced
Enable Glide gamma ramp: check
Force vSync: check
Antialiasiing: (set as you prefer, to me it's "app driven")

Go to "General" tab and configure as follows:

Appearance: Full Screen
Scalling mode: Unspecified
Miscellanneous:
Keep windows aspect ratio: Check
Capture mouse: Check

6. Launch "Summoner" and go to "setup";

7. Make sure "Detect Glide" is checked;

8. Click "Detect Available Cards";

*** Wait till wrapper is detected ***

9. Make sure "3DFX Glide" is in "Currently selected";

10. Set resolution as you please;

11. Don't forget to click "Detect" on "Speed" tab to make sure that wrapper is on the go;

12. Click "OK" to close launcher, then start the game;

P.S: There is slight problems with resolution scaling - since internal resolution of the game is 4:3, on 16:9 monitors you'll see that picture is a little bit stretched. For now, i don't have any solution for this, since you can only set "keep 4:3 aspect ratio" in "scaling mode" in dgVoodoo settings to make game running with black borders from left and right side of the screen, then it'll be unstretched. But for me there is no problems with stretched picture at all - spend a little time in game, and you'll forget about this.

Enjoy!