Ainz caster distance + summons 1

Arcane magic casters could only show their true ability at long range. Ainz had
no frontliners to cover for him, so there was no advantage in allowing his foe to
draw near to him.

[...]

Shalltear gripped her divine class Spuit Lance as she hastily threw a battle plan together.
That weapon’s special ability was to recover the wielder’s health in proportion to how much damage it did to an opponent. No, one could say that this divine class item was designed around that special property. This was why Ainz, the eternal backliner, had not summoned any minions to be his vanguard. He was very aware that summoning weak monsters to tank for him would only serve to recover her HP.

- Overlord; Vol 3; Chapter 5